20．－How often do you go back to your hometown?

－___________, but usually once every two years.

　　　 A．Generally speaking　　　　　　　　　　　　　　　 B．It just depends

　　　 C．It’s up to you　　　　　　　　　　　　　　　　　　　 D．I have no idea

19．I’d go with you on the trip, but I ___________ no time.

　　　 A．have　　　　　　　　　 B．had　　　　　　　　　　 C．have had　　　　　　 D．had had

18．Nancy let me repeat her instruction _______ sure that I understand what was ______ after she was away on business.

　　　 A．to make; to do　　　　　　　　　　　　　　　　　　 B．making; doing

　　　 C．to make; to be done　　　　　　　　　　　　　　 D．making; to do

17．Happy relations among people are very important. Therefore, ________ we do or say should be beneficial to building a harmonious society.

　　　 A．whichever　　　　　 B．whatever　　　　　　 C．no matter what　　 D．that