11. Some students should give up _________ (play) computer games.

10. We should learn how to achieve a __________(平衡) between work and play.

C. 用所给动词的正确形式填空。

9. Who are they __________(吵嘴) with over there?　

8. Teachers are usually __________(严格的) with their students in class.

7. Please _________(集中) your minds on the following problem.

6. Eating too much makes you __________(不健康).

5．　 My father is an _________ ( with lots of energy) man.　

B. 根据所给中文，填入正确的单词。

4．　 The high school students are all _________(teenage).

3．　 I think the new software is _________(value).

2．　 Stamp collecting is one of my _________(hobby).