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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。
volleyball maybe always do jog energy better happy so fit for
How to keep 1. ? Dr Li is giving a talk about health to the students.
You need to have healthy eating habits (习惯). Breakfast gives you enough 2. for the morning. So don't go to school without it. Fruit and vegetables are good 3. your health. But fast food, 4. makes you unhealthy. So eat the right food to keep you healthy.
5. sports can also help you keep fit. Any kind of sport is fine. For exam- ple, if you like working in groups, you can play 6. . If you like playing alone (独自), you can 7. or swim. But sometimes accidents (意外) can happen, 8. try to stay safe when you play them.
9. is important for your health. It is the best medicine (药). When you are sick (生病的), try to be happy and you'll feel 10. . You may feel bad if you are 11. unhappy.

1.fit 2.energy 3.for 4.maybe 5.Doing 6.volleyball 7.jog 8.so 9.Happiness 10.better 11.always