程序运行时，在Text1中输入字符串，单击“开始统计”按钮，在List1中显示统计结果。函数IsLetter(x)功能，若x是字母，则返回值为字母x在字母序列“A”~“Z”中的序号，如字母“A”的序号为0，字母“D”的序号为3。若x不是字母，则返回值为-1。

Function IsLetter(x As String) As Integer

        If "A" <= x And x <= "Z" Then

            IsLetter = Asc(x) - Asc("A")

        ElseIf "a" <= x And x <= "z" Then

            IsLetter = Asc(x) - Asc("a")

        Else

                       ①        

        End If

    End Function

    Private Sub Command1_Click()

        Dim d(25) As Integer, m As Integer, n As Integer

        Dim s As String, c As String

        List1.Clear

        For m = 0 To 25                  '初始化数组d

            d(m) = 0

        Next m

        s = Text1.Text

        For m = 1 To Len(s)              '读取字符串中的字符进行判断

            c = Mid(s, m, 1)

            n = IsLetter(c)

            If n <> -1 Then    ②  

        Next m

        For m = 0 To 25                  '输出结果

            If    ③   Then

               List1.AddItem (Chr(m + Asc("a")) & ":" & d(m))

            End If

        Next m

   End Sub

回答下列问题：

Dim b(4) As Integer         '数组b按位存储二进制数，数组类型为整型，元素个数为4个

Private Sub pprint(m As Integer) 

'本过程打印输出一行十进制数m和对应的二进制数

'代码略

End Sub

Private Sub Command1_Click()

  Dim i As Integer, j As Integer                                        

  List1.Clear                                                               

  List1.AddItem "十进制数      二进制数"                          

  For i = 1 To 4                                          

      b(i) = 0                                                   

  Next i

  For i = 0 To 15                                    

      Call pprint(i)                                    

      j =   1                '(1)         

      b(j) = b(j) + 1                  

      Do While  b(j) = 0     '(2)  

         b(j) = 0                            

         j = j - 1                          

         b(j) = b(j) + 1              

      Loop                                  

  Next i                                

End Sub

⑴{#blank#}1{#/blank#} ⑵{#blank#}2{#/blank#} 

k=int(input("输入一个四位数："))

   ①  

y=k%100

if    ②   :

    print("符合")

else:

    print("不符合")

方框处应填入的代码是（    ）

a= int(input("请输入整数a:"))

b= int(input("请输入整数b:"))

s=0

for i in     ①    :

    if     ②    :

        s=s+i

print("[" ,a, b,"]区间内的奇数和为:",s)

程序中划线①处应填入的代码为{#blank#}1{#/blank#}

程序中划线②处应填入的代码为{#blank#}2{#/blank#}

for i in range（X）：

print（i）