实现上述功能的VB程序如下，请回答下列问题。

Private Sub Command1_Click()

   Dim i As Integer, n As Integer, m As Integer

   Dim num As Integer, t As Integer

   Dim a(1 To 100) As Boolean

   n = Val(Text1.Text)

   m = Val(Text2.Text)

   For i = 1 To n

      a(i) = True

   Next i

       ①      

   Do While t > 1

      For i = 1 To n

        If a(i) = True Then   ②    

        If num = m The

               ③     

t = t - 1

           num = 0

           Text3.Text = Text3.Text + Str(i)

        End If

      Next i

   Loop

   For i = 1 To n

       If a(i) = True Then Label2.Caption ="获得礼品同学编号:" + Str(i)

   Next i

End Sub