填空题 阅读下面的程序：
Private Sub Form_Click( )
Dim Check As Boolean，Counter As Integer
Check=Tree
Counter=5
DO
DO While Counter＜20
Counter=Counter+1
If Counter=10 Then
Check=False
Exit Do
End if
Loop
Loop Until Check=False
Print Counter
End Sub
程序运行后，单击窗体，输出结果为 【9】 。