3. The students ____ (be) busy now. They ____ (have) an English exam next Monday.

2. The students ____ (do) their homework from four to five this afternoon.

1. I´m going to listen to the radio. Please ____ (not talk) any more.

21. Who will you ask for help if you _____?

　　　　　　　 A. robbed B. are robbed C. will be robbed D. will be stolen

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

　　　　　　　 old now.

　　　 　　　　A. built B. was built C. is built D. builds

19. When _____ the accident _____?

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

18. Many more houses _____ for teachers since last year.

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

17. This work _____ next Monday.

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

16. The big tree _____ by my brother ten years ago.　

　　　　　　　 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