52. Our math teacher has an unbelievable ability of ______(观察).

51. Nowadays we have many opportunities to go abroad, but how you ______(表现) in a foreign country is very important to the image of our country.

15. Study is not all about your life------you should also keep time ______ exercises and entertainment.

　 A　 for　　　　　　 B to　　　　　　　　 C from　　　　　 D in　

14. Reading and reciting is very important to learning a foreign language. ______ , you will find your English improved.

　 A since then　　　　 B every few years　　 C some time　　　 D over time

13. As students, we should keep a healthy diet and take regular exercises to ______ our body.

　 A care about　　　 B build up　　　　　 Ccarry away　　 D put down

12. Keeping away from the crowd and washing your hands often are good ways to keep yourself

　 ______ of the spreading H1N1 virus.

　 A safe　　　　　　 B healthy　　　　　 C free　　　　　 D strong

11. I’m very busy myself these days, so I really can’t help _______ your problem.

　 A to solve　　　　 B solving　　　　　 C solved　　　　　 D to solving

10. ------Since you didn’t agree with him, why didn’t you raise objections at the meeting?

　 ------Well, now I regret ______ that.

　 A to do　　　　　 B not to do　　　　 C doing　　　　　 D not doing

9. This company is developing very fast because it is very successful in ______ its market.

　 A struggling　　　 B expanding　　　 C exporting　　　　 D reducing