diff --git a/src/admin/api.ts b/src/admin/api.ts
index 2e68b2c..e0fb00c 100644
--- a/src/admin/api.ts
+++ b/src/admin/api.ts
@@ -263,7 +263,9 @@ export function setTutorialVisibility(id: number, is_public: boolean) {
 }
 
 export async function getAdminExercises(tutorialId: number) {
-  const res = await http.get("admin/exercise", { params: { tutorial_id: tutorialId } })
+  const res = await http.get("admin/exercise", {
+    params: { tutorial_id: tutorialId },
+  })
   return res.data as Exercise[]
 }
 
diff --git a/src/admin/tutorial/components/ExerciseManager.vue b/src/admin/tutorial/components/ExerciseManager.vue
index c538ca3..9237a67 100644
--- a/src/admin/tutorial/components/ExerciseManager.vue
+++ b/src/admin/tutorial/components/ExerciseManager.vue
@@ -1,5 +1,10 @@
 <script setup lang="ts">
-import { Exercise, ExerciseMcqData, ExerciseSortData } from "utils/types"
+import {
+  Exercise,
+  ExerciseMcqData,
+  ExerciseSortData,
+  ExerciseFillData,
+} from "utils/types"
 import {
   getAdminExercises,
   createExercise,
@@ -14,7 +19,7 @@ const dialog = useDialog()
 const exercises = ref<Exercise[]>([])
 const showForm = ref(false)
 const editingId = ref<number | null>(null)
-const formType = ref<"mcq" | "sort">("mcq")
+const formType = ref<"mcq" | "sort" | "fill">("mcq")
 const formOrder = ref(0)
 
 const mcqQuestion = ref("")
@@ -24,6 +29,9 @@ const mcqAnswer = ref(0)
 const sortQuestion = ref("")
 const sortCode = ref("")
 
+const fillQuestion = ref("")
+const fillCode = ref("")
+
 async function load() {
   exercises.value = await getAdminExercises(props.tutorialId)
 }
@@ -39,6 +47,8 @@ function openCreate() {
   mcqAnswer.value = 0
   sortQuestion.value = ""
   sortCode.value = ""
+  fillQuestion.value = ""
+  fillCode.value = ""
   showForm.value = true
 }
 
@@ -51,29 +61,51 @@ function openEdit(ex: Exercise) {
     mcqQuestion.value = d.question
     mcqOptions.value = [...d.options]
     mcqAnswer.value = d.answer
-  } else {
+  } else if (ex.type === "sort") {
     const d = ex.data as ExerciseSortData
     sortQuestion.value = d.question
     sortCode.value = d.lines.join("\n")
+  } else {
+    const d = ex.data as ExerciseFillData
+    fillQuestion.value = d.question
+    fillCode.value = d.code
   }
   showForm.value = true
 }
 
 async function save() {
-  const data =
-    formType.value === "mcq"
-      ? { question: mcqQuestion.value, options: mcqOptions.value, answer: mcqAnswer.value }
-      : {
-          question: sortQuestion.value || "将下列代码行排列为正确顺序",
-          lines: sortCode.value.split("\n").filter((l) => l.trim() !== ""),
-        }
+  let data: Record<string, unknown>
+  if (formType.value === "mcq") {
+    data = {
+      question: mcqQuestion.value,
+      options: mcqOptions.value,
+      answer: mcqAnswer.value,
+    }
+  } else if (formType.value === "sort") {
+    data = {
+      question: sortQuestion.value || "将下列代码行排列为正确顺序",
+      lines: sortCode.value.split("\n").filter((l) => l.trim() !== ""),
+    }
+  } else {
+    data = { question: fillQuestion.value, code: fillCode.value }
+  }
 
   try {
     if (editingId.value) {
-      await updateExercise({ id: editingId.value, type: formType.value, data, order: formOrder.value })
+      await updateExercise({
+        id: editingId.value,
+        type: formType.value,
+        data,
+        order: formOrder.value,
+      })
       message.success("练习题已更新")
     } else {
-      await createExercise({ tutorial_id: props.tutorialId, type: formType.value, data, order: formOrder.value })
+      await createExercise({
+        tutorial_id: props.tutorialId,
+        type: formType.value,
+        data,
+        order: formOrder.value,
+      })
       message.success("练习题已创建")
     }
     showForm.value = false
@@ -102,7 +134,15 @@ function copyPlaceholder(id: number) {
 }
 
 function typeName(type: string) {
-  return type === "mcq" ? "选择题" : "代码排序"
+  if (type === "mcq") return "选择题"
+  if (type === "sort") return "代码排序"
+  return "代码填空"
+}
+
+function typeTagType(type: string): "success" | "info" | "warning" {
+  if (type === "mcq") return "success"
+  if (type === "sort") return "info"
+  return "warning"
 }
 </script>
 
@@ -110,7 +150,9 @@ function typeName(type: string) {
   <div>
     <n-flex justify="space-between" align="center" style="margin-bottom: 16px">
       <n-text>共 {{ exercises.length }} 道练习题</n-text>
-      <n-button type="primary" size="small" @click="openCreate">+ 添加练习题</n-button>
+      <n-button type="primary" size="small" @click="openCreate"
+        >+ 添加练习题</n-button
+      >
     </n-flex>
 
     <n-empty v-if="exercises.length === 0" description="暂无练习题" />
@@ -119,11 +161,7 @@ function typeName(type: string) {
       <n-list-item v-for="ex in exercises" :key="ex.id">
         <n-flex justify="space-between" align="center">
           <div>
-            <n-tag
-              size="small"
-              :type="ex.type === 'mcq' ? 'success' : 'info'"
-              :bordered="false"
-            >
+            <n-tag size="small" :type="typeTagType(ex.type)" :bordered="false">
               {{ typeName(ex.type) }}
             </n-tag>
             <n-text style="margin-left: 10px">
@@ -133,12 +171,16 @@ function typeName(type: string) {
           <n-space :size="8">
             <n-tooltip trigger="hover">
               <template #trigger>
-                <n-button size="small" @click="copyPlaceholder(ex.id)">复制占位符</n-button>
+                <n-button size="small" @click="copyPlaceholder(ex.id)"
+                  >复制占位符</n-button
+                >
               </template>
               将 [[exercise:{{ ex.id }}]] 粘贴到 Markdown 内容中
             </n-tooltip>
             <n-button size="small" @click="openEdit(ex)">编辑</n-button>
-            <n-button size="small" type="error" @click="confirmDelete(ex.id)">删除</n-button>
+            <n-button size="small" type="error" @click="confirmDelete(ex.id)"
+              >删除</n-button
+            >
           </n-space>
         </n-flex>
       </n-list-item>
@@ -155,11 +197,16 @@ function typeName(type: string) {
           <n-radio-group v-model:value="formType" :disabled="!!editingId">
             <n-radio value="mcq">选择题</n-radio>
             <n-radio value="sort">代码排序</n-radio>
+            <n-radio value="fill">代码填空</n-radio>
           </n-radio-group>
         </n-form-item>
 
         <n-form-item label="顺序">
-          <n-input-number v-model:value="formOrder" :min="0" style="width: 100px" />
+          <n-input-number
+            v-model:value="formOrder"
+            :min="0"
+            style="width: 100px"
+          />
         </n-form-item>
 
         <template v-if="formType === 'mcq'">
@@ -168,7 +215,12 @@ function typeName(type: string) {
           </n-form-item>
           <n-form-item label="选项（正确答案前选择单选按钮）">
             <n-space vertical style="width: 100%">
-              <n-flex v-for="(opt, i) in mcqOptions" :key="i" align="center" :size="8">
+              <n-flex
+                v-for="(opt, i) in mcqOptions"
+                :key="i"
+                align="center"
+                :size="8"
+              >
                 <n-radio
                   :value="i"
                   :checked="mcqAnswer === i"
@@ -182,19 +234,32 @@ function typeName(type: string) {
                 <n-button
                   size="small"
                   :disabled="mcqOptions.length <= 2"
-                  @click="() => { mcqOptions.splice(i, 1); if (mcqAnswer >= mcqOptions.length) mcqAnswer = mcqOptions.length - 1 }"
+                  @click="
+                    () => {
+                      mcqOptions.splice(i, 1)
+                      if (mcqAnswer >= mcqOptions.length)
+                        mcqAnswer = mcqOptions.length - 1
+                    }
+                  "
                 >
                   ✕
                 </n-button>
               </n-flex>
-              <n-button size="small" @click="mcqOptions.push('')">+ 添加选项</n-button>
+              <n-button size="small" @click="mcqOptions.push('')"
+                >+ 添加选项</n-button
+              >
             </n-space>
           </n-form-item>
         </template>
 
-        <template v-else>
+        <template v-else-if="formType === 'sort'">
           <n-form-item label="题目">
-            <n-input v-model:value="sortQuestion" type="textarea" :rows="2" placeholder="将下列代码行排列为正确顺序" />
+            <n-input
+              v-model:value="sortQuestion"
+              type="textarea"
+              :rows="2"
+              placeholder="将下列代码行排列为正确顺序"
+            />
           </n-form-item>
           <n-form-item label="正确代码（每行将自动成为一道排序项）">
             <n-input
@@ -206,6 +271,26 @@ function typeName(type: string) {
             />
           </n-form-item>
         </template>
+
+        <template v-else>
+          <n-form-item label="题目说明">
+            <n-input
+              v-model:value="fillQuestion"
+              type="textarea"
+              :rows="2"
+              placeholder="例：补全下面的循环语句"
+            />
+          </n-form-item>
+          <n-form-item label="含空位的代码">
+            <n-input
+              v-model:value="fillCode"
+              type="textarea"
+              :rows="10"
+              placeholder="用 {{答案}} 标记空位，多个合法答案用 | 分隔，例如：for {{i|idx}} in range(10):"
+              style="font-family: monospace"
+            />
+          </n-form-item>
+        </template>
       </n-form>
 
       <template #footer>
diff --git a/src/admin/tutorial/detail.vue b/src/admin/tutorial/detail.vue
index 3941a8d..7780832 100644
--- a/src/admin/tutorial/detail.vue
+++ b/src/admin/tutorial/detail.vue
@@ -64,7 +64,6 @@ async function submit() {
       await updateTutorial(tutorial)
       message.success("修改已保存")
     }
-    router.push({ name: "admin tutorial list" })
   } catch (err: any) {
     message.error(err.data)
   }
diff --git a/src/oj/api.ts b/src/oj/api.ts
index ee0aab2..8a77a28 100644
--- a/src/oj/api.ts
+++ b/src/oj/api.ts
@@ -423,6 +423,8 @@ export function getProblemSetUserProgress(
 }
 
 export async function getExercises(tutorialId: number): Promise<Exercise[]> {
-  const res = await http.get("exercises", { params: { tutorial_id: tutorialId } })
+  const res = await http.get("exercises", {
+    params: { tutorial_id: tutorialId },
+  })
   return res.data
 }
diff --git a/src/oj/learn/components/ExerciseFill.vue b/src/oj/learn/components/ExerciseFill.vue
new file mode 100644
index 0000000..52c2b16
--- /dev/null
+++ b/src/oj/learn/components/ExerciseFill.vue
@@ -0,0 +1,160 @@
+<script setup lang="ts">
+import hljs from "highlight.js/lib/core"
+import python from "highlight.js/lib/languages/python"
+import c from "highlight.js/lib/languages/c"
+import { Exercise, ExerciseFillData } from "utils/types"
+
+hljs.registerLanguage("python", python)
+hljs.registerLanguage("c", c)
+
+const props = defineProps<{ exercise: Exercise; lang?: string }>()
+const data = computed(() => props.exercise.data as ExerciseFillData)
+
+type CodeSeg = { type: "code"; html: string }
+type BlankSeg = { type: "blank"; answers: string[]; index: number }
+type Segment = CodeSeg | BlankSeg
+
+function escapeHtml(s: string): string {
+  return s.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")
+}
+
+const segments = computed<Segment[]>(() => {
+  const blanks: string[][] = []
+  const markedCode = data.value.code.replace(/\{\{([^}]+)\}\}/g, (_, inner) => {
+    blanks.push(inner.split("|"))
+    return `____${blanks.length - 1}____`
+  })
+
+  const lang =
+    props.lang === "python" ? "python" : props.lang === "c" ? "c" : null
+  let highlighted: string
+  if (lang) {
+    try {
+      highlighted = hljs.highlight(markedCode, { language: lang }).value
+    } catch {
+      highlighted = escapeHtml(markedCode)
+    }
+  } else {
+    highlighted = escapeHtml(markedCode)
+  }
+
+  const parts = highlighted.split(/____(\d+)____/)
+  const result: Segment[] = []
+  for (let i = 0; i < parts.length; i++) {
+    if (i % 2 === 0) {
+      if (parts[i]) result.push({ type: "code", html: parts[i] })
+    } else {
+      const idx = parseInt(parts[i])
+      result.push({ type: "blank", answers: blanks[idx], index: idx })
+    }
+  }
+  return result
+})
+
+const blankCount = computed(
+  () => segments.value.filter((s) => s.type === "blank").length,
+)
+const userInputs = ref<string[]>([])
+const wrongBlanks = ref<Set<number>>(new Set())
+const allCorrect = ref(false)
+
+watch(() => props.exercise.id, reset, { immediate: true })
+
+function reset() {
+  userInputs.value = Array(blankCount.value).fill("")
+  wrongBlanks.value = new Set()
+  allCorrect.value = false
+}
+
+function submit() {
+  if (allCorrect.value) return
+  const wrong = new Set<number>()
+  for (const seg of segments.value) {
+    if (seg.type !== "blank") continue
+    if (!seg.answers.includes(userInputs.value[seg.index]?.trim() ?? "")) {
+      wrong.add(seg.index)
+    }
+  }
+  wrongBlanks.value = wrong
+  allCorrect.value = wrong.size === 0
+}
+
+function inputWidth(idx: number): string {
+  return Math.max(4, (userInputs.value[idx]?.length ?? 0) + 2) + "ch"
+}
+</script>
+
+<template>
+  <n-card
+    size="small"
+    style="margin: 16px 0; border: 1.5px solid var(--n-border-color)"
+  >
+    <template #header>
+      <n-tag type="warning" size="small" :bordered="false"
+        >练一练 · 代码填空</n-tag
+      >
+    </template>
+
+    <p style="font-weight: 500; margin-bottom: 12px">{{ data.question }}</p>
+
+    <pre
+      :style="{
+        fontFamily: 'monospace',
+        lineHeight: '1.6',
+        background: 'var(--n-color)',
+        border: '1px solid var(--n-border-color)',
+        borderRadius: '6px',
+        padding: '12px',
+        overflowX: 'auto',
+        whiteSpace: 'pre-wrap',
+        margin: 0,
+      }"
+    ><template v-for="(seg, i) in segments" :key="i"
+      ><span v-if="seg.type === 'code'" v-html="seg.html" /><input
+        v-else
+        :value="userInputs[seg.index]"
+        :disabled="allCorrect"
+        :style="{
+          width: inputWidth(seg.index),
+          fontFamily: 'monospace',
+          padding: '1px 4px',
+          borderRadius: '3px',
+          border: `1.5px solid ${
+            allCorrect
+              ? '#18a058'
+              : wrongBlanks.has(seg.index)
+                ? '#d03050'
+                : 'var(--n-border-color)'
+          }`,
+          background: allCorrect
+            ? 'rgba(24,160,88,0.08)'
+            : wrongBlanks.has(seg.index)
+              ? 'rgba(208,48,80,0.07)'
+              : 'transparent',
+          outline: 'none',
+          color: 'inherit',
+          minWidth: '4ch',
+        }"
+        @input="userInputs[seg.index] = ($event.target as HTMLInputElement).value"
+      /></template></pre>
+
+    <n-alert
+      v-if="wrongBlanks.size > 0 || allCorrect"
+      :type="allCorrect ? 'success' : 'error'"
+      :title="allCorrect ? '全部正确！' : '有填写错误，请检查红色标注的空位'"
+      style="margin-top: 12px"
+    />
+
+    <n-space style="margin-top: 12px" :size="8">
+      <n-button
+        type="warning"
+        size="small"
+        :disabled="allCorrect"
+        @click="submit"
+      >
+        提交
+      </n-button>
+      <n-button size="small" @click="reset">重置</n-button>
+    </n-space>
+  </n-card>
+</template>
diff --git a/src/oj/learn/components/ExerciseMcq.vue b/src/oj/learn/components/ExerciseMcq.vue
index 9b49b13..07220a4 100644
--- a/src/oj/learn/components/ExerciseMcq.vue
+++ b/src/oj/learn/components/ExerciseMcq.vue
@@ -39,10 +39,15 @@ function optionType(idx: number): "default" | "primary" | "success" {
 </script>
 
 <template>
-  <n-card size="small" style="margin: 16px 0; border: 1.5px solid var(--n-border-color)">
+  <n-card
+    size="small"
+    style="margin: 16px 0; border: 1.5px solid var(--n-border-color)"
+  >
     <template #header>
       <n-space align="center" :size="8">
-        <n-tag type="success" size="small" :bordered="false">练一练 · 选择题</n-tag>
+        <n-tag type="success" size="small" :bordered="false"
+          >练一练 · 选择题</n-tag
+        >
       </n-space>
     </template>
 
@@ -56,11 +61,17 @@ function optionType(idx: number): "default" | "primary" | "success" {
         :secondary="optionType(idx) !== 'default'"
         :tertiary="optionType(idx) === 'default'"
         :strong="idx === selected"
-        :style="{ justifyContent: 'flex-start', width: '100%', textAlign: 'left' }"
+        :style="{
+          justifyContent: 'flex-start',
+          width: '100%',
+          textAlign: 'left',
+        }"
         @click="select(idx)"
       >
         <template #icon>
-          <span style="font-weight: 700">{{ String.fromCharCode(65 + idx) }}</span>
+          <span style="font-weight: 700">{{
+            String.fromCharCode(65 + idx)
+          }}</span>
         </template>
         {{ opt }}
       </n-button>
diff --git a/src/oj/learn/components/ExerciseSort.vue b/src/oj/learn/components/ExerciseSort.vue
index 32a1b1c..91776d6 100644
--- a/src/oj/learn/components/ExerciseSort.vue
+++ b/src/oj/learn/components/ExerciseSort.vue
@@ -27,7 +27,9 @@ function shuffle(arr: LineItem[]): LineItem[] {
 }
 
 function init() {
-  lines.value = shuffle(data.value.lines.map((text, idx) => ({ originalIdx: idx, text })))
+  lines.value = shuffle(
+    data.value.lines.map((text, idx) => ({ originalIdx: idx, text })),
+  )
   submitted.value = false
 }
 
@@ -55,7 +57,9 @@ function lineStatus(idx: number): "correct" | "wrong" | "default" {
   return lines.value[idx].originalIdx === idx ? "correct" : "wrong"
 }
 
-const allCorrect = computed(() => lines.value.every((item, i) => item.originalIdx === i))
+const allCorrect = computed(() =>
+  lines.value.every((item, i) => item.originalIdx === i),
+)
 
 function submit() {
   submitted.value = true
@@ -72,11 +76,14 @@ function escapeHtml(text: string): string {
 const lineHtmlMap = computed<Record<number, string>>(() => {
   const rawLines = data.value.lines
   const map: Record<number, string> = {}
-  const lang = props.lang === "python" ? "python" : props.lang === "c" ? "c" : null
+  const lang =
+    props.lang === "python" ? "python" : props.lang === "c" ? "c" : null
 
   if (lang) {
     try {
-      const result = hljs.highlight(rawLines.join("\n"), { language: lang }).value
+      const result = hljs.highlight(rawLines.join("\n"), {
+        language: lang,
+      }).value
       result.split("\n").forEach((html, i) => {
         map[i] = html
       })
@@ -94,9 +101,14 @@ const lineHtmlMap = computed<Record<number, string>>(() => {
 </script>
 
 <template>
-  <n-card size="small" style="margin: 16px 0; border: 1.5px solid var(--n-border-color)">
+  <n-card
+    size="small"
+    style="margin: 16px 0; border: 1.5px solid var(--n-border-color)"
+  >
     <template #header>
-      <n-tag type="info" size="small" :bordered="false">练一练 · 代码排序</n-tag>
+      <n-tag type="info" size="small" :bordered="false"
+        >练一练 · 代码排序</n-tag
+      >
     </template>
 
     <p style="font-weight: 500; margin-bottom: 12px">{{ data.question }}</p>
@@ -127,7 +139,6 @@ const lineHtmlMap = computed<Record<number, string>>(() => {
                 : 'transparent',
           cursor: 'grab',
           fontFamily: 'monospace',
-          fontSize: '13px',
           userSelect: 'none',
         }"
         @dragstart="onDragStart(idx)"
@@ -147,7 +158,12 @@ const lineHtmlMap = computed<Record<number, string>>(() => {
     />
 
     <n-space style="margin-top: 12px" :size="8">
-      <n-button type="info" size="small" :disabled="submitted && allCorrect" @click="submit">
+      <n-button
+        type="info"
+        size="small"
+        :disabled="submitted && allCorrect"
+        @click="submit"
+      >
         提交
       </n-button>
       <n-button size="small" @click="reset">重置</n-button>
@@ -158,29 +174,51 @@ const lineHtmlMap = computed<Record<number, string>>(() => {
 <style>
 .hljs-keyword,
 .hljs-operator,
-.hljs-selector-tag { color: #d73a49; }
+.hljs-selector-tag {
+  color: #d73a49;
+}
 .hljs-string,
 .hljs-regexp,
-.hljs-template-literal { color: #032f62; }
+.hljs-template-literal {
+  color: #032f62;
+}
 .hljs-comment,
-.hljs-quote { color: #6a737d; font-style: italic; }
+.hljs-quote {
+  color: #6a737d;
+  font-style: italic;
+}
 .hljs-number,
-.hljs-literal { color: #005cc5; }
+.hljs-literal {
+  color: #005cc5;
+}
 .hljs-built_in,
 .hljs-title.function_,
-.hljs-class .hljs-title { color: #6f42c1; }
+.hljs-class .hljs-title {
+  color: #6f42c1;
+}
 
 .dark .hljs-keyword,
 .dark .hljs-operator,
-.dark .hljs-selector-tag { color: #c678dd; }
+.dark .hljs-selector-tag {
+  color: #c678dd;
+}
 .dark .hljs-string,
 .dark .hljs-regexp,
-.dark .hljs-template-literal { color: #98c379; }
+.dark .hljs-template-literal {
+  color: #98c379;
+}
 .dark .hljs-comment,
-.dark .hljs-quote { color: #7f848e; font-style: italic; }
+.dark .hljs-quote {
+  color: #7f848e;
+  font-style: italic;
+}
 .dark .hljs-number,
-.dark .hljs-literal { color: #e5c07b; }
+.dark .hljs-literal {
+  color: #e5c07b;
+}
 .dark .hljs-built_in,
 .dark .hljs-title.function_,
-.dark .hljs-class .hljs-title { color: #61afef; }
+.dark .hljs-class .hljs-title {
+  color: #61afef;
+}
 </style>
diff --git a/src/oj/learn/components/ExerciseWidget.vue b/src/oj/learn/components/ExerciseWidget.vue
index b678b2d..b7fbfc8 100644
--- a/src/oj/learn/components/ExerciseWidget.vue
+++ b/src/oj/learn/components/ExerciseWidget.vue
@@ -3,11 +3,21 @@ import { Exercise } from "utils/types"
 
 const ExerciseMcq = defineAsyncComponent(() => import("./ExerciseMcq.vue"))
 const ExerciseSort = defineAsyncComponent(() => import("./ExerciseSort.vue"))
+const ExerciseFill = defineAsyncComponent(() => import("./ExerciseFill.vue"))
 
 defineProps<{ exercise: Exercise; lang?: string }>()
 </script>
 
 <template>
   <ExerciseMcq v-if="exercise.type === 'mcq'" :exercise="exercise" />
-  <ExerciseSort v-else-if="exercise.type === 'sort'" :exercise="exercise" :lang="lang" />
+  <ExerciseSort
+    v-else-if="exercise.type === 'sort'"
+    :exercise="exercise"
+    :lang="lang"
+  />
+  <ExerciseFill
+    v-else-if="exercise.type === 'fill'"
+    :exercise="exercise"
+    :lang="lang"
+  />
 </template>
diff --git a/src/oj/learn/composables/useExerciseParse.ts b/src/oj/learn/composables/useExerciseParse.ts
index 5751235..e033f6d 100644
--- a/src/oj/learn/composables/useExerciseParse.ts
+++ b/src/oj/learn/composables/useExerciseParse.ts
@@ -4,7 +4,10 @@ type Segment =
   | { type: "md"; content: string }
   | { type: "exercise"; exercise: Exercise }
 
-export function parseExercises(content: string, exercises: Exercise[]): Segment[] {
+export function parseExercises(
+  content: string,
+  exercises: Exercise[],
+): Segment[] {
   const exerciseMap = new Map(exercises.map((e) => [e.id, e]))
   const segments: Segment[] = []
   const regex = /\[\[exercise:(\d+)\]\]/g
@@ -13,7 +16,10 @@ export function parseExercises(content: string, exercises: Exercise[]): Segment[
 
   while ((match = regex.exec(content)) !== null) {
     if (match.index > lastIndex) {
-      segments.push({ type: "md", content: content.slice(lastIndex, match.index) })
+      segments.push({
+        type: "md",
+        content: content.slice(lastIndex, match.index),
+      })
     }
     const id = parseInt(match[1])
     const exercise = exerciseMap.get(id)
diff --git a/src/oj/learn/index.vue b/src/oj/learn/index.vue
index 858270f..2966a7e 100644
--- a/src/oj/learn/index.vue
+++ b/src/oj/learn/index.vue
@@ -34,7 +34,11 @@
               :theme="isDark ? 'dark' : 'light'"
               :model-value="seg.content"
             />
-            <ExerciseWidget v-else :exercise="seg.exercise" :lang="tutorial.type" />
+            <ExerciseWidget
+              v-else
+              :exercise="seg.exercise"
+              :lang="tutorial.type"
+            />
           </template>
         </n-card>
       </n-gi>
@@ -74,7 +78,11 @@
               :theme="isDark ? 'dark' : 'light'"
               :model-value="seg.content"
             />
-            <ExerciseWidget v-else :exercise="seg.exercise" :lang="tutorial.type" />
+            <ExerciseWidget
+              v-else
+              :exercise="seg.exercise"
+              :lang="tutorial.type"
+            />
           </template>
         </n-tab-pane>
 
@@ -86,11 +94,21 @@
       <n-divider style="margin: 12px 0" />
 
       <n-flex align="center" justify="space-between">
-        <n-button secondary type="primary" :disabled="isFirstLesson" @click="goToPrevLesson">
+        <n-button
+          secondary
+          type="primary"
+          :disabled="isFirstLesson"
+          @click="goToPrevLesson"
+        >
           ← 上一课
         </n-button>
         <n-text>{{ step }} / {{ titles.length }}</n-text>
-        <n-button secondary type="primary" :disabled="isLastLesson" @click="goToNextLesson">
+        <n-button
+          secondary
+          type="primary"
+          :disabled="isLastLesson"
+          @click="goToNextLesson"
+        >
           下一课 →
         </n-button>
       </n-flex>
@@ -106,8 +124,12 @@ import { getTutorial, getTutorials, getExercises } from "../api"
 import { parseExercises } from "./composables/useExerciseParse"
 import { useBreakpoints } from "shared/composables/breakpoints"
 
-const ExerciseWidget = defineAsyncComponent(() => import("./components/ExerciseWidget.vue"))
-const CodeEditor = defineAsyncComponent(() => import("shared/components/CodeEditor.vue"))
+const ExerciseWidget = defineAsyncComponent(
+  () => import("./components/ExerciseWidget.vue"),
+)
+const CodeEditor = defineAsyncComponent(
+  () => import("shared/components/CodeEditor.vue"),
+)
 
 const isDark = useDark()
 const route = useRoute()
@@ -119,7 +141,12 @@ const step = computed(() => {
   return parseInt(route.params.step[0])
 })
 
-const tutorial = ref<Partial<Tutorial>>({ id: 0, title: "", content: "", code: "" })
+const tutorial = ref<Partial<Tutorial>>({
+  id: 0,
+  title: "",
+  content: "",
+  code: "",
+})
 const titles = ref<{ id: number; title: string }[]>([])
 const exercises = ref<Exercise[]>([])
 const activeTab = ref("content")
@@ -147,7 +174,10 @@ async function init() {
   titles.value = res1.data
   if (titles.value.length === 0) return
   const id = titles.value[step.value - 1].id
-  const [res2, exs] = await Promise.allSettled([getTutorial(id), getExercises(id)])
+  const [res2, exs] = await Promise.allSettled([
+    getTutorial(id),
+    getExercises(id),
+  ])
   if (res2.status === "fulfilled") tutorial.value = res2.value.data
   exercises.value = exs.status === "fulfilled" ? exs.value : []
 }
diff --git a/src/shared/components/Header.vue b/src/shared/components/Header.vue
index b9519cd..8d08f73 100644
--- a/src/shared/components/Header.vue
+++ b/src/shared/components/Header.vue
@@ -30,23 +30,26 @@ function toggleDark(event: MouseEvent) {
     isDark.value = !isDark.value
     return
   }
-  document.startViewTransition(() => {
-    isDark.value = !isDark.value
-  }).ready.then(() => {
-    document.documentElement.animate(
-      {
-        clipPath: [
-          `circle(0px at ${x}px ${y}px)`,
-          `circle(${radius}px at ${x}px ${y}px)`,
-        ],
-      },
-      {
-        duration: 400,
-        easing: "ease-in-out",
-        pseudoElement: "::view-transition-new(root)",
-      },
-    )
-  }).catch(() => {})
+  document
+    .startViewTransition(() => {
+      isDark.value = !isDark.value
+    })
+    .ready.then(() => {
+      document.documentElement.animate(
+        {
+          clipPath: [
+            `circle(0px at ${x}px ${y}px)`,
+            `circle(${radius}px at ${x}px ${y}px)`,
+          ],
+        },
+        {
+          duration: 400,
+          easing: "ease-in-out",
+          pseudoElement: "::view-transition-new(root)",
+        },
+      )
+    })
+    .catch(() => {})
 }
 
 // 从 store 中获取屏幕模式状态
diff --git a/src/shared/components/MermaidEditor.vue b/src/shared/components/MermaidEditor.vue
index 6c8b65d..5656dbc 100644
--- a/src/shared/components/MermaidEditor.vue
+++ b/src/shared/components/MermaidEditor.vue
@@ -73,7 +73,8 @@ const renderMermaid = async () => {
     renderSuccess.value = false
 
     const errorDiv = document.createElement("div")
-    errorDiv.style.cssText = "color: #ff4d4f; padding: 20px; text-align: center; border: 1px dashed #ff4d4f; border-radius: 4px;"
+    errorDiv.style.cssText =
+      "color: #ff4d4f; padding: 20px; text-align: center; border: 1px dashed #ff4d4f; border-radius: 4px;"
     const titleP = document.createElement("p")
     titleP.textContent = "Mermaid语法错误"
     const detailP = document.createElement("p")
diff --git a/src/utils/types.ts b/src/utils/types.ts
index bb33383..949af2d 100644
--- a/src/utils/types.ts
+++ b/src/utils/types.ts
@@ -590,10 +590,15 @@ export interface ExerciseSortData {
   lines: string[]
 }
 
+export interface ExerciseFillData {
+  question: string
+  code: string
+}
+
 export interface Exercise {
   id: number
-  type: 'mcq' | 'sort'
-  data: ExerciseMcqData | ExerciseSortData
+  type: "mcq" | "sort" | "fill"
+  data: ExerciseMcqData | ExerciseSortData | ExerciseFillData
   order: number
 }