diff --git a/01-hello.rb b/01-hello.rb
index e0e7bbf..f0e0216 100644
--- a/01-hello.rb
+++ b/01-hello.rb
@@ -1,8 +1,7 @@
 # 题目: 输入名字，输出 "Hello, 名字"
 
 print "请输入你的名字，然后按 Enter: "
-your_name = gets
 
-# ...
+your_name = gets
 
-puts "(请替换成最后的答案)"
\ No newline at end of file
+puts "Hello, #{your_name}"
diff --git a/02-variable.rb b/02-variable.rb
index a5a4753..d94a652 100644
--- a/02-variable.rb
+++ b/02-variable.rb
@@ -6,8 +6,11 @@
 puts "a 是 #{a}"
 puts "b 是 #{b}"
 
-# ...
+c = a
+a = b
+b = c
 
-puts "a 应该是 2，现在是 #{a}"
-puts "b 应该是 1，现在是 #{b}"
+puts "a \"应该\"是 2，现在是 #{a}"
+puts "b \"应该\"是 1，现在是 #{b}"
 
+# 这才是真正的学习了，什么叫 “ ’=’ 是赋值运算符(assignment operator)，是指派右边的值到左边的变量”
diff --git a/03-triangle.rb b/03-triangle.rb
index fafec03..00e3c5e 100644
--- a/03-triangle.rb
+++ b/03-triangle.rb
@@ -6,6 +6,6 @@
 print "请输入直角三角形的底边，然后按 Enter: "
 b = gets
 
-# .....
+c = a.to_f * b.to_f / 2
 
-puts "直角三角形的面积是: _________"
\ No newline at end of file
+puts "直角三角形的面积是: #{c}"
diff --git a/04-pizzas.rb b/04-pizzas.rb
index 4c2521f..d2c0cb4 100644
--- a/04-pizzas.rb
+++ b/04-pizzas.rb
@@ -6,7 +6,8 @@
 print "请输入有多少人要吃，然后按 Enter: "
 people = gets
 
-# .....
+a = pizzas.to_i
+b = people.to_i
 
-puts "每人可分得几片: _________ 片"
-puts "还剩下几片: _________ 片"
\ No newline at end of file
+puts "每人可分得几片: #{a/b} 片"
+puts "还剩下几片: #{a%b} 片"
diff --git a/05-bmi.rb b/05-bmi.rb
index 67efdff..51be6c8 100644
--- a/05-bmi.rb
+++ b/05-bmi.rb
@@ -10,8 +10,18 @@
 print "请输入您的身高(厘米)，然后按 Enter: "
 height = gets
 
-# .....
+b = height.to_f/100
 
-puts "您的 BMI 是: _________"
+a = weight.to_f/(b * b)
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
\ No newline at end of file
+if a < 18.5
+  c = "过轻"
+elsif a >= 24
+  c = "过重"
+else
+  c = "正常"
+end
+
+puts "您的 BMI 是: #{a}"
+
+puts "您的 BMI 结果是: #{c}"
diff --git a/06-interger-positive.rb b/06-interger-positive.rb
index a240f5f..c6ad3d6 100644
--- a/06-interger-positive.rb
+++ b/06-interger-positive.rb
@@ -4,7 +4,19 @@
 print "请输入一个整数，然后按 Enter: "
 x = gets
 
-# ....
+if x.to_i > 0
+  a = "正数"
+elsif x.to_i < 0
+  a = "负数"
+else
+  a = "零"
+end
 
-puts "这个数是_____ (正数或零或负数)"
-puts "这个数是_____ (偶数或奇数)"
\ No newline at end of file
+if x.to_i % 2 == 0
+  b = "偶数"
+else
+  b = "奇数"
+end
+
+puts "这个数是#{a}"
+puts "这个数是#{b}"
diff --git a/07-abcde.rb b/07-abcde.rb
index 5d0c8c3..d16ac81 100644
--- a/07-abcde.rb
+++ b/07-abcde.rb
@@ -17,6 +17,22 @@
 print "请输入一个整数z，然后按 Enter: "
 z = gets
 
-# ....
+if x.to_i < 0
+  a = "A"
+else
+  if y.to_i > 0
+    if z.to_i > 0
+      a = "B"
+    else
+      a = "C"
+    end
+  else
+    if z.to_i >0
+      a = "D"
+    else
+      a = "E"
+    end
+  end
+end
 
-puts "结果是________(A或B或C或D或E)"
\ No newline at end of file
+puts "结果是#{a}"
diff --git a/08-find-max.rb b/08-find-max.rb
index 9e6e643..e80071b 100644
--- a/08-find-max.rb
+++ b/08-find-max.rb
@@ -9,6 +9,18 @@
 print "请输入一个数字z，然后按 Enter: "
 z = gets
 
-# ....
+if x.to_f > y.to_f
+  if x.to_f > z.to_f
+    c = "x"
+  else
+    c = "z"
+  end
+else
+  if y.to_f > z.to_f
+    c = "y"
+  else
+    c = "z"
+  end
+end
 
-puts "最大的数是 ________(x或y或z)"
\ No newline at end of file
+puts "最大的数是 #{c}"
diff --git a/09-function.rb b/09-function.rb
index b1f922d..acc468e 100644
--- a/09-function.rb
+++ b/09-function.rb
@@ -1,7 +1,7 @@
 # 题目: 输入直角三角形的宽和高，输出三角形的面积
 
 def calculate_area(a, b)
-  # ....
+  a.to_f * b.to_f / 2
 end
 
 print "请输入直角三角形的高，然后按 Enter: "
@@ -12,4 +12,4 @@ def calculate_area(a, b)
 
 answer = calculate_area(a,b)
 
-puts "直角三角形的面积是: #{answer}"
\ No newline at end of file
+puts "直角三角形的面积是: #{answer}"
diff --git a/10-function.rb b/10-function.rb
index bb450fb..cb7faf5 100644
--- a/10-function.rb
+++ b/10-function.rb
@@ -1,6 +1,19 @@
 # 题目: 使用者输入 x,y,z，请输出三个数中最大的数
 
 def find_max(x, y, z)
+  if x.to_f > y.to_f
+    if x.to_f > z.to_f
+      c = "x"
+    else
+      c = "z"
+    end
+  else
+    if y.to_f > z.to_f
+      c = "y"
+    else
+      c = "z"
+    end
+  end
 end
 
 print "请输入一个数字x，然后按 Enter: "
@@ -12,8 +25,7 @@ def find_max(x, y, z)
 print "请输入一个数字z，然后按 Enter: "
 z = gets
 
-# ....
 
 answer = find_max(x,y,z)
 
-puts "最大的数是 #{answer}"
\ No newline at end of file
+puts "最大的数是 #{answer}"