diff --git a/01-hello.rb b/01-hello.rb
index e0e7bbf..33fbd61 100644
--- a/01-hello.rb
+++ b/01-hello.rb
@@ -2,7 +2,4 @@
 
 print "请输入你的名字，然后按 Enter: "
 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..53b4c95 100644
--- a/02-variable.rb
+++ b/02-variable.rb
@@ -6,8 +6,9 @@
 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}"
-
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..b140762 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
 
-# .....
+c = pizzas.to_i / people.to_i
+d = pizzas.to_i % 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: #{c} 片"
+puts "还剩下几片: #{d}片"
diff --git a/05-bmi.rb b/05-bmi.rb
index 67efdff..0f28694 100644
--- a/05-bmi.rb
+++ b/05-bmi.rb
@@ -10,8 +10,22 @@
 print "请输入您的身高(厘米)，然后按 Enter: "
 height = gets
 
-# .....
+h = height.to_f / 100
 
-puts "您的 BMI 是: _________"
+BMI = (weight.to_f / (h * h))
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
\ No newline at end of file
+def c
+   if BMI < 18.5
+      c = "过轻"
+      else if
+         BMI >= 24
+         c = "过重"
+      else c = "正常"
+      end
+   end
+end
+
+
+puts "您的 BMI 是: #{BMI}"
+
+puts "您的 BMI 结果是: #{c}(过轻或正常或过重)"
diff --git a/06-interger-positive.rb b/06-interger-positive.rb
index a240f5f..4896af0 100644
--- a/06-interger-positive.rb
+++ b/06-interger-positive.rb
@@ -2,9 +2,17 @@
 
 
 print "请输入一个整数，然后按 Enter: "
-x = gets
+x = gets.to_i
 
-# ....
+if x > 0
+   puts "这个数是正数"
+      else if x ==0
+      puts "这个数是0"
+   else puts "这个数是负数"
+end
+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 % 2 ==0
+   puts "这个数是偶数"
+else puts "这个数是奇数"
+end
diff --git a/07-abcde.rb b/07-abcde.rb
index 5d0c8c3..44f43c4 100644
--- a/07-abcde.rb
+++ b/07-abcde.rb
@@ -9,14 +9,33 @@
 #     当 z < 0 输出 "E"
 
 print "请输入一个整数x，然后按 Enter: "
-x = gets
+x = gets.to_f
 
 print "请输入一个整数y，然后按 Enter: "
-y = gets
+y = gets.to_f
 
 print "请输入一个整数z，然后按 Enter: "
-z = gets
+z = gets.to_f
 
-# ....
+if x < 0
+   puts "结果是A"
+end
 
-puts "结果是________(A或B或C或D或E)"
\ No newline at end of file
+if x > 0
+   if y > 0
+      if z > 0
+         puts "结果是B"
+      elsif z < 0
+         puts "结果是C"
+      end
+   end
+
+   if y < 0
+      if z > 0
+         puts "结果是D"
+      elsif z < 0
+         puts "结果是E"
+      end
+   end
+
+end
diff --git a/08-find-max.rb b/08-find-max.rb
index 9e6e643..3768d5a 100644
--- a/08-find-max.rb
+++ b/08-find-max.rb
@@ -9,6 +9,14 @@
 print "请输入一个数字z，然后按 Enter: "
 z = gets
 
-# ....
+if x > y && x > z
+   puts "最大的数是#{x}"
+end
 
-puts "最大的数是 ________(x或y或z)"
\ No newline at end of file
+if y > x && y > z
+   puts "最大的数是#{y}"
+end
+
+if z > x && z > y
+   puts "最大的数是#{z}"
+end
diff --git a/09-function.rb b/09-function.rb
index b1f922d..6801e49 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)
-  # ....
+  calculate_area = a.to_f * b.to_f
 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..9756441 100644
--- a/10-function.rb
+++ b/10-function.rb
@@ -1,19 +1,25 @@
-# 题目: 使用者输入 x,y,z，请输出三个数中最大的数
+# 题目: 使用者输入 x,y,z，请输出三个数中最大的数。使用回传值表示
 
 def find_max(x, y, z)
+   if x > z && x > y
+      return x
+   elsif y > z && y > x
+      return y
+   elsif z > x && z > y
+      return z
+   end
 end
 
 print "请输入一个数字x，然后按 Enter: "
-x = gets
+x = gets.to_f
 
 print "请输入一个数字y，然后按 Enter: "
-y = gets
+y = gets.to_f
 
 print "请输入一个数字z，然后按 Enter: "
-z = gets
+z = gets.to_f
 
-# ....
 
 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}"
diff --git a/11-seven.rb b/11-seven.rb
index 26c221d..7c45c11 100644
--- a/11-seven.rb
+++ b/11-seven.rb
@@ -2,8 +2,8 @@
 
 i = 1
 while ( i <= 100 )
-
-  # ....
-
-  i+=1
-end
\ No newline at end of file
+   if i % 7 == 0
+      puts i
+   end
+   i+= 1
+end
diff --git a/12-sum-even.rb b/12-sum-even.rb
index 73879bb..fe7befc 100644
--- a/12-sum-even.rb
+++ b/12-sum-even.rb
@@ -4,10 +4,10 @@
 total = 0
 
 while ( i <= 100 )
-
-  # ....
-
+   if i % 2 ==0
+      total = total + i
+   end
   i+=1
 end
 
-puts total
\ No newline at end of file
+puts total
diff --git a/13-nn.rb b/13-nn.rb
index ac0a43b..cd5cbab 100644
--- a/13-nn.rb
+++ b/13-nn.rb
@@ -1,11 +1,16 @@
 # 题目: 输入一个数字 N，输出 N * N 乘法表
 
 print "请输入数字 N，然后按 Enter: "
-n = gets
+n = gets.to_i
+i = 0
+j = 0
 
-# while ( ... )
-#   while ( ...)
-#
-#   end
-# end
 
+while (i <= n)
+   j = i
+   while  (j <= n)
+      puts "#{i} * #{j} = #{i*j}"
+      j += 1
+   end
+   i += 1
+end
diff --git a/14-prime.rb b/14-prime.rb
index 8cf1692..ce4ad8a 100644
--- a/14-prime.rb
+++ b/14-prime.rb
@@ -1,14 +1,23 @@
 # 输入一个数字 N，请检查是不是质数
 
 def is_prime(n)
-# ....
+   i = 2
+   while (i <= n/2 + 1)
+      if n % i != 0
+         return true
+      else
+         return false
+      end
+      i += 1
+   end
+
 end
 
-print "请输入数字 N，然后按 Enter: "
+print "请输入一个数字N，然后按 enter："
 n = gets
 
 if is_prime(n.to_i)
-  puts "这是质数"
+   puts "这是质数"
 else
-  puts "这不是质数"
+   puts "这不是质数"
 end
diff --git a/15-guess-number.rb b/15-guess-number.rb
index 48f9dca..2766f50 100644
--- a/15-guess-number.rb
+++ b/15-guess-number.rb
@@ -6,12 +6,12 @@
   print "请猜一个 0~99 的数字 N，然后按 Enter: "
   n = gets
 
-  #puts "太低了，再猜一次"
-  #puts "太高了，再猜一次"
-
-  if n.to_i == target
-    puts "恭喜猜中啦! "
-    break
+  if n.to_i > target
+     puts "太高了，再猜一次"
+  elsif n.to_i < target
+     puts "太低了，再猜一次"
+  elsif n.to_i == target
+      puts "恭喜猜中啦! "
+      break
   end
-
-end
\ No newline at end of file
+end
diff --git a/16-array-sum.rb b/16-array-sum.rb
index 9b4910b..1da8378 100644
--- a/16-array-sum.rb
+++ b/16-array-sum.rb
@@ -1,11 +1,16 @@
 # 给定一阵列内含数字，输出最大值
 
 def find_max(array)
-  #....
+   m = array[0]
+   array.each do |i|
+      if m <= i
+         m = i
+      end
+   end
+   return m
 end
 
 arr = [8, 12, 36, 53, 9, 75, 3, 71, 59, 88]
 
 max = find_max(arr)
 puts "Max is #{max}" # 应该是 88
-