20. The boss had to go to Beijing on business on March 28, _____ happened to be his only son’s birthday.

　 A. where　　　　 　　　　 B. when　　　　　　　　　　　　　　　 C. that 　　　　　　　　　　　　 D. which

19. ---We must start out early, _____ possible traffic delay.

　 --- Yes, we can easily _____ in it.

　 A. allow for; get struck　　　　　　　　　　　　 　 B. allowing for; get struck

　 C. allow for; get stuck　　　　　　　　　　　　　 D. allowing for; get stuck

18. Studies have shown that our most _____ scientists produce not only some of the best ideas, but also _____ bad ones.

　　 A. respected; a great many of　　　　　　 　　　 B. respectable; a great deal of

　　 C. respected; a great deal of　　　　　　 　 D. respected; a great many

17. Please remind me ___ he said he was coming. I may have time to meet him at the airport.

　 　　 A. where　　　　　 　 B. when　　　　　　　 　　 C. how　　　　　 　　　 D. what

16. Meryl Streep won the best actress_______, which was a _____ for her hard work.

　　 A. reward; reward　 　　　　　　　　　　　　　　　　　　　　　　　 B. award; award　　　　 　

C. award; reward　　　 　　　　　　　　　　　　　　　　　　　　　　　　 D. reward; award