1. Have you ever heard of      (外星人)?

(   ) 13. --Look！What's the driver doing?

―He       the car by the road.

A. must be repairing    B. must repair

C. may repair    D. could be repairing

(   ) 12. It can't be your father,      ？

A. can't it B. isn't it C. can it    D. is it

20. 一些人认为巨石阵是用来阻止疾病的。

Some people think the Stonehenge________  _______  ___________  __________ illness.  

19. 这座桥被建造超过很长一段时间了。

The bridge was built over____________  _________  _________  _________  _______.

18. 蚂蚁是一种昆虫吗？

Are ants_______  _________  __________ insect?

17. 不管谁指出我们的缺点，我将纠正它们。

No matter who__________       our problems,we will correct them.

16. 在澳大利亚，大多数人彼此之间用英语交流。

In Australia,most people_________  __________ each other in English.

(   ) 15. ―Do you come to South Korea for the       of seeing your family or doing business? 

—I come here on business.

A. interest    B. benefit C. purpose    D. thought

(   ) 14. It's said Stonehenge was built to celebrate a victory       an enemy.

A. for    B. over C. to    D. on