19. Because of the wars, people had to f　　　　　　　 　from the country.

18. The key to solving the problem lies in the w　　　　　　　 　to take action.

17. There is no other a　　　　　　 . You must finish the work within two days.

16. At the Earth Summit conferences, there are always r　　　　　 　from all over the world.

15. _________ stepping into his room, he was __________ to find the floor covered with ants.

　 A. At, astonished　　　 　　　 B. In astonishing　　 C. On astonished　　 D. By, astonishing

14. The old man __________ several __________ ducks.

　 A. raise, dozen　　　　　 B. keeps, dozens　　 C. keeps, dozen　　　 D. rise, dozen

13. What do you suggest __________ this afternoon?

　 A. to do　　　　　　　　　　 B. us to do　　　　　　 C. we shall do　　　　 D. doing

12. – What do you suppose made his parents angry?　　 　 - ___________.

　 A. As he failed　　　　　 B. Failed　　　　　　　 C. His failure　　　　 D. Because of failure

11. – Who’s taken away my glasses?　　　　　　 - __________,

　 A. I have　　　　　　　　　 B. She did　　　　　　 C. He took it　　　　　 D. Him

10. Not only __________ polluted but __________ crowded.

　 A. was the city, were the streets　　　　　　　 B. the city was, were the streets

　 C. was the city, the streets were　　　　　　　 D. the city was, the streets were