20. It is I ____ your friend.

　A. am　　　　　　　 B. that is　　　　 C. who am　　 　　　D. who is

19. Was it in 1969 _____ the American astronauts succeeded ____ landing the moon?

　A. when; on　　　　 B. that; on　　　 C. when ; in　　　　 D. that; in

18. We plant trees ____, and the young trees grow taller ______.

　A. year by year; year after year　　　 B. year after year; year by year

　C. year by year; year by year　　　　 D. year after year; year after year

17. You are not in good health. I think you could improve your _____ by running every day.

　A. position　　　　 B. situation　　　 C. condition　　　 D. energy

16. ----- What can I do for you, sir?

　 ----- I need a guide ___ Italy. I’m going there for a visit next week. I want to learn something about the country.

　A. of　　　　　　 B. for　　　　　　 C. to　　　　　　　 D. in

15. We’ve got to be ____ and buy only what we can afford.

　A real　　　　　　 B. actual　　　　 C. practical　　　　　 D. true

14. You’ll have to finish your homework, ______.

　A. long it takes however　　　　　　　 B. it takes however long

　C. long however it takes　　　　　　　 D. however long it takes

13. ---- Next week we will have the final English exam.

　 ---- Yes. Then every minute must be made full use _____ English.

　A. of studying　　　 B. to study　　　　 C. of being studied　　 D. of to use

12. It was about 600 years ago ____ the first clock with a face and an hour hand was made.

　A. that　　　　　　 B. until　　　　　 C. before　　　　　 D. when

11. Your performance in the driving test didn’t reach the required standard. ____, you failed.

　A. In the end　　　　 B. After all　　　 C. In other words　 D. At the same time