Dim i As Integer, s As Integer

Dim a (1 To 10)As Integer

For i =1 To 10

a(i)=i^2

If a(i)Mod 3=0 And a(i)Mod 5 =0 Then s= 50000+ a(i)

If a(i)Mod 3=0 Or a(i) Mod 5 =0 Then s =s+ a(i)

Next i

Text1. Text Str(s)

执行该程序段后，下列说法正确的是（  ）

实现上述功能的VB代码如下，但加框处代码有错，请改正。

Dim a(1 To 20)As String   ‘用于存储20个字符串

‘将20个字符串分别保存赋值给数组元素a(1)、a(2)、a(3)、a(4)、…、a(19)、a(20)，并在列表框List1中显示

Private Sub Form_Load()

‘代码略

End Sub

Private Sub Command1_Click()

Dim s As String, n As Integer, i As Integer

Dim flag As Boolean  ‘变量flag用于标记是否在数组a中筛选到左边与s匹配的字符串

List2.Clear  ‘筛选时清空上次筛选结果

s=Text1.Text

n=Len(s)

flag=False

For i=1 To 20

  If  Then   ‘{#blank#}1{#/blank#}

   List2.AddItem a(i)

   flag=True

  End If

Next i

If flag=False Then

     ‘{#blank#}2{#/blank#}

End If

End Sub

为实现上述功能请在划线处填上合适代码

Private Sub confirm_Click()

Dim i As Integer, j As Integer

Dim n As Integer, m As Integer Dim k As Integer, s As String Const length=6

n=Val(Text1.Text)i=1

List1.Clear

s=""

For j=1Tolength

k=Int(Rnd()*3)+1

If k=1Then

    m=Int(Rnd()*26)+1

    s=s+Chr(Asc("a")+m-1)

ElseIf k=2Then

    m=Int(Rnd()*26)+1

    s=s+Chr(Asc("A")+m-1)

Else

    m=⑴{#blank#}1{#/blank#}

    s=s+Chr(Asc("0")+m-1)

    EndIf

    Next j

    List1.AddItemStr(i)+""+s

    ⑵{#blank#}2{#/blank#}

Loop

End Sub