实现上述功能的VB程序如下，但加框处代码有错，请改正。

Const n=10

Dim a(1 To n)As Integer

Private Sub Form_Load()

‘获取排序前数据，并依次存储在数组a中，并在文本框Text1中显示。代码略

End Sub

Private Sub Command1_Click()

  Dim i As Integer，j As Integer，t As Integer

  Dim top As Integer

  top=1

  For i=1 To n-1

    For j= To n-1              ‘⑴{#blank#}1{#/blank#}

       If a(i)>a(j+1)Then

       t=a(j)：a(j)=a(j+1)：a(j+1)=t

     ElseIf a(j)=a(j+1)Then     ‘相邻两个数据相等，由前面数据对进行覆盖处理

                        ‘⑵{#blank#}2{#/blank#}

       top=top+1

      End If

     Next j

    Next i

    Text2．Text=“ ”

    For i=top To n

      Text2．Text=Text2．Text+Str(a(i))

    Next i

  End Sub

Dim a(1 To 10) As Integer

Dim s As String, n, i As Integer

s = "54851845236": n = Len(s)

For i = 1 To n - 1

a(i) = Val(Mid(s, i, 2))

Next i

For i = 1 To n - 2

k = i

For j = i + 1 To n - 1

If a(k) < a(j) Then k = j

Next

If k <> i Then

t = a(k): a(k) = a(i): a(i) = t

End If

Next i

Text1.Text = Str(a(1))

该程序段运行后，文本框 Text1 中显示的内容是：（  ）

For i=1 To 6

 k=i

 For j=i+1 To 7

   If a(j)<a(k) Then k=j

 Next j

 If i<>k Then

   t=a(i):a(i)= a(k):a(k)= t

 End If

Next i

在排序过程中,经过某一遍排序“加工”后，数组元素a(1)到a(7)的数据依次为“10,41,75,12,63,11,85”｡则下一遍排序“加工”后数组元素a(1)到a(7)的数据依次是（  ）

For i=1 To 7

 k=i

 For j=i+1 To 8

  If a(j)>a(k) And a(j)>85 Then k=j

 Next j

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

Next i

数组元素a(1)到a(8)的原始数据依次为“89，70，79，85，99，80，82，74”，则第3遍“加工”后数组元素a(1)到a(8)的数据依次是（  ）

n = Val(Text1.Text)

For i = 1 to n

 a(i) = i

Next i

For i = 1 to n/2-1

 For j = n to 2*(i+1) step -2

  If      ①    Then t = a(j):a(j)=a(j-2):a(j-2)=t

 Next j

For j = 1 to n- i*2 step 2

  If      ②    Then t = a(j):a(j)=a(j+2):a(j+2)=t

 Next j

Next i