用括号内所给动词的适当形式填空。
1. —Oh, dear! I can't find Jim.
    —He _____ (play) football there. Can you see him?
2. My English teacher spends as much time as he can _____ (help) us to improve our spoken English.
3. You'd better _____ (not read) without enough light.
4. If you _____ (not be) healthy enough, your father won't let you go to the summer camp.
5. _____ (move) the heavy boxes of wine, the young man used two shopping carts.
6. The lovely boy _____ (wear) glasses swims faster than all the boys in my class.
7. Hey, boy! _____ (not smoke) in public. It's rude.
8. Who do you think _____ (do) the most after-school activities in our class?
9. My good friend James often _____ (fly) to Hong Kong because of his business (生意).
10. I guess the teachers _____ (chat) in the teachers' office about how to organize the spring outing 
      at this moment.