三、选词填空。
请先阅读下面短文，掌握其大意，然后用方框中所给词的适当形式填空。每个词限用一次。
own helpful focus bring advice stop feed water litter understand cut
Do you know that there are students wasting(浪费) a lot of food? Students do not just 1. healthy food. They also waste 2. by wasting food. Farmers need to use a lot of water to 3. the animals like pigs or chickens we eat. We should 4. on the problem of food waste.
There are ways to avoid(避免) waste food. One way is to make your 5. food at home. Most students have little time to eat at school, so they 6. the food they can eat in a short time. You should also only take as much food for lunch as you know you can eat. This way can be 7. to solve the problem.
A good way 8. wasting food is to get others to help you. At school, you can ask your teachers for 9. about food waste. Or start a group to help others 10. food waste. When the students and teachers all help, your school can 11. down on food waste.

1. litter
2. water
3. feed
4. focus
5. own
6. bring
7. helpful
8. to stop
9. advice
10. (to) understand
11. cut