20. That white building _____ two years ago, but it looks quite

　　　　　　　 old now.

　　　　　　　 A. built B. was built C. is built D. builds (2000河北)

19. When _____ the accident _____? (2000辽宁)

　　　　　　　 A. was; happened B. has; happened C. did; happen D. was; happening

18. Many more houses _____ for teachers since last year. (2000广州)

　　　　　　　 A. are building B. built C. have built D. have been built

17. This work _____ next Monday. (2000广西)

　　　　　　　 A. may finish B. finish C. finishes D. may be finished

16. The big tree _____ by my brother ten years ago. (2000甘肃)

　　　　　　　 A. was planted B. planted C. has planted D. was planting

15. By _____ was the book _____?

　　　　　　　 A. who; wrote B. whom; write C. whose; writing D. whom; written

14. Will the job _____ in ten minutes?

　　　　　　　 A. finish B. be finish C. be finished D. finished

13. A present _____ me by my friend on my birthday.

　　　　　　　 A. is giving B. was given to C. is given for D. will give to

12. The young tree _____ the stick.

　　　　　　　 A. should be tied to B. must be tied by C. should tie to D. can be

　　　　　　　 tied with

11. In 1620, about half the USA _____ forests.

　　　　　　　 A. was covered B. was covered by C. were filled with D. covered

　　　　　　　 with