阅读下面的程序： PriVate Sub Form_C1ick() Dim Check As Booleau，Counter As Integer Check=True 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______。