diff --git a/stage03-functions/01-basic-functions/main.go b/stage03-functions/01-basic-functions/main.go
index 0765506..b400d78 100644
--- a/stage03-functions/01-basic-functions/main.go
+++ b/stage03-functions/01-basic-functions/main.go
@@ -1,6 +1,9 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 func exercise1() int {
 	fmt.Println("=== 练习1：无参数单返回值函数 ===")
@@ -9,14 +12,11 @@ func exercise1() int {
 	// 定义一个函数cube，接收一个int参数，返回其立方
 	// 调用这两个函数并返回它们的和
 
-	____ func ____
-		square := func(n int) ____ { return n * n }
-		____
-	}
+	square := func(n int) int { return n * n }
 
-	cube := func(n int) ____ { ____ }
+	cube := func(n int) int { return n * n * n }
 
-	return ____(3) + ____(2)
+	return square(3) + cube(2)
 }
 
 func exercise2(a, b int) {
@@ -25,19 +25,23 @@ func exercise2(a, b int) {
 	// 定义一个函数，接收两个int参数a和b
 	// 打印a + b, a - b, a * b
 	// 格式: "加: 5, 减: 1, 乘: 6"
-	fmt.Printf("加: %d, 减: %d, 乘: %d\n", ____, ____, ____)
+	sum := a + b
+	difference := a - b
+	product := a * b
+
+	fmt.Printf("加: %d, 减: %d, 乘: %d\n", sum, difference, product)
 }
 
 func exercise3(nums ...int) int {
 	fmt.Println("\n=== 练习3：可变参数 ===")
 
 	// 定义一个可变参数函数，计算所有数字的和
-	sum := ____
-	for _, num := range ____ {
-		____
+	sum := 0
+	for _, num := range nums {
+		sum += num
 	}
 
-	return ____
+	return sum
 }
 
 func exercise4(name, city string) (string, string) {
@@ -47,13 +51,13 @@ func exercise4(name, city string) (string, string) {
 	// nameWithGreeting: 格式为 "Hello, {name}"
 	// info: 格式为 "{name} lives in {city}"
 
-	var ____ string
-	var ____
+	var nameWithGreeting string
+	var info string
 
 	nameWithGreeting = fmt.Sprintf("Hello, %s", name)
 	info = fmt.Sprintf("%s lives in %s", name, city)
 
-	return ____, ____
+	return nameWithGreeting, info
 }
 
 func exercise5(name string) string {
@@ -63,13 +67,13 @@ func exercise5(name string) string {
 	// 返回大写的name
 	// 提示：使用strings.ToUpper
 
-	____ := ____
+	upperName := strings.ToUpper(name)
 
-	return ____
+	return upperName
 }
 
 func main() {
-	fmt.Println("=== 基础函数 练习 ===\n")
+	fmt.Println("=== 基础函数 练习 ===")
 
 	result1 := exercise1()
 	fmt.Printf("练习1结果: %d\n", result1)