在Excel中，在保存好文件之后，要退出。Excel程序有很多种方法，______不能退出Excel程序。

A．按快捷键Alt+F4
B．按快捷键Ctrl+W
C．按快捷键Alt+F，然后按字母键X
D．用鼠标左键单击Excel窗口右上角的关闭按钮

When you see Tom and his sister, tell _____ that _____ mother is waiting at the gate.[ ]

A. his; his

B. her; hers

C. them; their

D. his; her