从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

21. He received a wonderful present from his students on ________ Teachers' Day, which was really ________ pleasure for him.

　　 A. the; /　　　 B. /; /　　　　　　 C. the; a　　　　　 D. /; a

20. Genius is one percent inspiration and nintety-nine percent perspiration______________________________

19. Imagination is more important than knowledge.

　 ________________________________________________

17.even if　 __________　　　　 18.go on with __________

15.take a look at__________　　　ge one’s mind _________

13.use up 　__________　　　　　 14. look up to __________

11. the other way around__________ 12. turn out__________

9. current affairs__________　　　 10.on all sides __________