Private Sub Command1_Click()

Dim s As Integer

Dim n As Integer

Dim i As Integer

n = Val(Text1.Text)

s = 1

For i = 2 To n

  s = s * i

Next i

Label1.Caption = Str(n) + "!=" + Str(s)

End Sub

上述流程图中虚线框部分的内容可为（   ）

Private Sub Command1_Click()

  Dim a(0 To 5) As Integer

  Dim i As Integer               ’①

  a(0) = 1                      '②

  For i = 1 To 5

    a(i) = 2 * a(i - 1) + 1          '③

  Next i

  Text1.Text = Str(a(6))         '④

End Sub

Private Sub Command1_Click()

Dim i As Integer, j As Integer, sum As Integer

Dim n As Integer, k As Integer, tmp As String

n = Val (Text1.Text)

sum = 0:List1.Clear

For i = 1 To n-1

 j=i

 Do While sum < n

  {#blank#}1{#/blank#}

 j = j + 1

 Loop

 If sum = n Then

  {#blank#}2{#/blank#}

  For k=i+1 To j-1

   tmp = tmp + “+” + Str(k)

  Next k

  List1.AddItem tmp +“=”+ Str(n)

  End If

  {#blank#}3{#/blank#}

 Next i

 End Sub