15. -Where is Tom ?

　　 -Well , he 　　　　you 　　　　　here . Otherwise he would come down right now .

　 A．didn’t know ; were 　　　　　　　　　　　　　　　 B．hasn’t known ; are

C．doesn’t know ; are 　　　　　　　　　　　　　　　 D．hadn’t known ; were

14. All of the guests 　　　　　by 9 o’clock , but the host 　　　　until 15 minutes later .

　 A．arrived ; didn’t turn up 　　　　　　　　　　　　 B．had arrived ; didn’t turn up

C．arrived ; hadn’t turned up 　　　　　　　　　　 D．had arrived; hadn’t turned up

13. Mike didn’t notice Alice entering his room. He ____ a phone call.

　 A．answered　　 B. has answered　　 C. was answering　　　 D. is answering

12. -Did you find the missing couple in the mountain yesterday?

　　-No, but we ________ to get in touch with them ever since.

　 A．have tried　　　　　 　　　 B. have been trying

　 C．had tried　　　　　　　　　 D. had been trying

11. -Such a mistake could have been avoided.

　 -Unfortunately, he _______ the mistake again and again.

　 A．repeated　　　　　　　　　　 B. would repeat

　 C．had repeated　　　　　　　　　　 D. would have repeated

10.　 -May I remind you that a Mr. Wang is waiting outside, sir?

　　　 -Oh, that’s right. I 　　　about it.

　 A．forget　　　　　　　　　 B．had forgotten　　　 C．forgot　　　　　　　　 D．have forgotten

9. -Did you enjoy your holiday?

-Yes, it’s the best holiday I　　　 these years.　　　　　　　　　　　　　　　

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

8. Just look at the room. My roommate ____ up his clothes.

　 A．is never hanging　　　 B. will never hang　　 C. never hangs　 D. never hanged

7. I ____ to send him a telegram to congratulate him on his marriage, but I ____ it.

A．hoped,　 hadn’t managed　　 　B. has hoped, didn’t manage

　 C．hope, don’t manage　　　　　 D. had hoped, didn’t manage

6.　 -It’s a long time　 since we met last. Haven’t you graduated from college yet?

　 　-_____. I　 ______ English for four years in Nanjing University.

　 A．No, study　　 B. Yes, have studied　　 C. No, am studying　　 D. Yes, studied