20. I _______ the dance performance many times, each giving me a new understanding.

　　　 A. watch　　　　　　　　　 B. watched　　　　　　　　 C. have watched　　　　 D. am watching

19. The economic impact study was conducted by a group of _______ selected MBA students at the University of Kansas.

　　　 A. especially 　　　　　　 B. specially　 　　　　　　 C. regularly　 　　　　　 D. potentially

18. _______ any other species, human populations are shaped by the usual forces of natural selection, like famine, disease or climate.

　　　 A. Compared with　 　　　　　　　　　　　　　　　　 B. As with　 　　　　　　　 C. As for 　 D. In addition to

17. - I’m terribly sorry to keep you waiting for so long.

　 - _______.

　　　 A. Never mind.　　　　　 B. That’s right.　　　　　 C. You are welcome.　 D. Don’t mention it.

16. It’s extremely dangerous for the drivers to _______ speed as the traffic lights are changing.

　　　 A. pull up　　　　　　　　 B. put up　　　　　　　　　 C. rise up　　　　　　　　　 D. pick up

15. The government is now trying to provide _______ health benefits to all citizens in China.

　　　 A. significant　　　　　　 B. universal　　　　　　　 C. temporary　　　　　　 D. professional

14. With more than 17000 islands, _____ only 6000 are inhabited, Indonesia is the world’s largest archipelago (岛国).

　　　 A. on which　　　　　　　 B. for which　　　　　　　 C. of which　　　　　　　 D. along which

13. - Where will you start your work after graduation？

　 - It’s not been decided yet. I _______ continue my studies for a higher degree.

　　　 A. need　　 　　　　　　　 B. might　　 　　　　　　 C. would 　　　　　　　　 D. must

12. If more readers become comfortable with reading digitally, _______ but the book-collectors will want to buy paper books.

　　　 A. anyone　　　　　　　　 B. someone　　　　　　　 C. no one　　　　　　　　　 D. none

11. Nearly three days after an 8.8-magnitude earthquake, rescuers in Chile were making every effort to _______ possible survivors.

　　　 A. trap　　　　　　　　　　　 B. reach　　　　　　　　　　 C. shelter　　　　　　　　　 D. seize