根据句意，用括号中所给词的适当形式填空。
1. Those students were teaching _____,and their teacher wasn't there. They really work hard. (they)
2. Doing enough exercise is good for your _____. ( healthy )
3. When you catch a bad fever, you'd better _____ a good rest. ( take )
4. Long ago Maria _____ movies to TV shows. But now she doesn't like to watch TV any more. ( prefer )
5. Would you please _____ (not play) computer games again?
6. We Chinese are very _____ (friend) to the foreigners.
7. I'm really sorry for ______ (lose) your English book again.
8. The children must not go to ______ (crowd) places.
9. Headache can often make you_____ (worry).
10. I'll buy four _____ (tomato) and two eggs for lunch.
