Private Sub Command1_Click()

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

    n = Val(Text1.Text)

    s = ""

    For i = 1 To 2 * n - 1

        If i <= n Then  ① Else  ②  

Next i

    Label1.Caption = s

End Sub

为实现以上功能，划线①②处应分别填写（   ）

Dim a(1 To 10) As Integer，i As Integer，j As Integer

a(1)=1

a(2)=1

For i=3 To 5

a(i)=1

For j=i-1 To 2 Step -1

a(j)=a(j)+a(j-1)

Next j

Next i

Text1.Text=Str(a(3))

该程序段运行后，在文本框Text1中显示的内容是(  )

T=1：K=1

Do While K<=5

T=T*K

K=K+2

Loop