实现上述功能的VB程序代码如下，请在划线处填上合适的代码。

Dim a( 1 To 20) As Integer

Private Sub Command1_Click ( )

Dim key As Integer

key =   ①   

i = 1

Do While key > a ( i ) And ( i <= 1 5 )

i = i + 1

Loop

Label4.Caption = “该数插入的位置是：” + Str ( i )

If  i = 16  Then

a ( i ) = key

Else

For j = 16  To  i + 1 Step -1

    ②  

Next j

a ( i ) = key

End  If

List2. Clear

For i = 1 To 16

List2.AddItem a( i)

Next i

End Sub

Private Sub Form_Load( )

'随机生成15个200以内的正整数

Randomize

For i = 1 To 15

a ( i ) = Int(Rnd * 200) + 1

Next i

'将15个数从小到大排序

For i = 1 To 14

k = i

For j = i + 1 To 15

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

Next j

If  i <>k  Then

t = a(i)； a( i) = a ( k )：a ( k )

End  If

Next i

'将排好序的数输出在列表框Listl中

Listl.Clear

For i = 1 To 15

Listl.AddItem str ( a ( i ) )

Next i

End Sub

程序中①划线处应填入{#blank#}1{#/blank#}，程序中②划线处应填入{#blank#}2{#/blank#}

Private Sub Command1_Click()

For i = 150 To 300

    a = i \ 100

    b = I mod 100 \ 10

    c = i – a*100 – b*10

    If i = a * a * a + b * b * b + c * c * c Then

        Label1.Caption = Str(i)

    End If

Next i

End Sub

执行该算法，依次输入a的值2，5，4后，变量b的值为（  ）

i=1：n=5

Do while i<=n

   x=Int(Rnd*9)+1

    If x Mod 2=1 Then

        a(i)=x

    Else

        a(n)=x:n=n+1

    End If

   i=i+1 Loop

数组元素的初值均为0，执行该程序段后，a(1)至a(5)的值可能是（ ）