执行下面的程序,在窗体上显示的输出结果的第一行是_____,第二行是______. Private Sub Form_Click() Dim s As String, i As Integer, flag As Boolean s="THIS IS A BOOK." S=LCase(s) Print s Flag=True For I=1 to Len(s) If Mid(s, i, 1)= " " Then flag=True ElseIf flag Then S=Left(s, I-1) & UCase(Mid(s, i, 1)) & Right(s, len(s)-i) Flag=False End If Next i Print S End Sub