1. 从方框中选择合适的词语，并用其适当形式填空

be absent, be interested in, from time to time, take up, deal with, used to, hang out, in public, be afraid of, worry about

1. （1） Nowadays many children playing computer games.

3. （2） Do you know how to this problem.

5. （3） He made up a story to explain why he .

7. （4） , I looked up from my notebook.

9. （5） He has decided that he'll drop medicine and physics.

11. （6） I like to at mall with my friends.

13. （7） She is shy about singing .

15. （8） He ride his bike to work, but now he drives to work.

17. （9） We all know sheep wolves.

19. （10） Don't him; he is a cheerful man.