实现上述功能的VB程序如下：

Const n=10

Dim a(1 To 10)As Integer

Private Sub Command1  Click()

For i=1 To n

               ‘①

    List1．Addltem Str(a(i))

    Next i

End Sub

 Private Sub Command2  Click()

    tmp=1

    For i=1 To n-1

    For j=n To i+1 Step-1

    If  ＞0 Then    ①

    t=a(j)：a(j)=a(j-1)：a(j-1)=t

    End If

    Next j

    ②

    Next i

    For i=1 To 10

    List2．Addltem Str(a(i))

    Next i

 End Sub

i = 1 : k = 0

Do While i<= 3

For j = 8 To i + 1 Step -1

If a(j) >= a(j - 1) Then

t = a(j): a(j) = a(j-1): a(j-1) = t

k = k + 1 

End If

Next j

i = i + 1

Loop

若数组a中的数据依次为“24，29，31，24，12，10，12，25”，则加工结束后，变量k的值为（  ）

实现以上功能的VB程序如下,在横处填入合适的代码。

Dim a(1 To 20) As Integer     ‘存储区间的左端点数值

Dim b(1 To 20) As Integer     ‘存储区间的右端点数值

Private Sub Form_Load()

‘将区间左端点存入数组a,区间右端点存入数组b,并在列表框List1显示,代码略

End Sub

Private Sub Command1_Click()

Dim i As Integer, j As Integer

Dim curL As Integer, curR As Integer

For i=1 To n-1

 For j=1 To n-i

  If{#blank#}1{#/blank#}Then

   t=a(j): a(j)=a(j+1): a(j+1)=t

   t=b(j): b(j)=b(j+1): b(j+1)=t

  End If

 Next j

Next i

curL=a(1): curR=b(1)

For i=2 To n

 If{#blank#}2{#/blank#}Then

  If curR < b(i) Then{#blank#}3{#/blank#}

 Else

  List2.AddItem“["+Str(curL)+Str(curR)+"]”

  curL=a(i): curR=b(i)

 End If

Next i

List2. AddItem “[”+Str(curL)+Str(curR)+“]”

End Sub

For i=1 To ①    

  k=i

  For j=i+1 To n-i+1

If a(k)>a(j) Then k= ②    

  Next j

  If k<>i Then t=a(k):a(k)=a(i):a(i)=t For j= ③      

    If a(j)<a(j+1) Then a(j)=a(j)+a(j+1) : a(j+1)=a(j)-a(j+1):a(j)=a(j)-a(j+1) Next j

Next i

上述程序段3个划线处的表达式分别为（  ）

Private Sub Command2_Click()

Dim i As Integer, j As Integer, tmp As Integer

Dim s1 As String, t As Integer, s2 As String

t=1

For i=1 To n-2

    For j= To n Step 2     ‘改错

        If a(i)*t>a(j)*t Then

            tmp =a(i): a(i)= a(j): a(j)=tmp

        End if

    Next j

                   ‘填空①

Next i

For i =1 To n

    If     Then       ‘填空②

        s1 =s1 Str(a(i))

    Else

        s2=s2+Str(a(i))

    End If

Text2. Text=“奇数位：”+s1

Text3. Text=“偶数位：”+s2

End Sub

回答以下问题：

If temp>=a(n) Then

    a(n+1)=temp

Else

    j=n

    Do While j>=1 And temp<a(j)

        j=j-1

    Loop

End If

要使程序实现上述功能，则方框①②中的语句分别是（   ）