近20年来，各方面的调查表明：青少年的体质不断降低。请你以How to keep healty为题，写一篇80词左右的短文，说说你的怎么看和建议。开头已给出，不计入总词数。
主要内容包含：
1. 体质降低是什么原因。如：eat too much junk food, have too much homework...
2. 适当的健康建议。如：should do more exercise, eat a balanced diet, enough sleep...
【出色满分范本】
How to keep healthy
Nowadays students physical fitness is declining year by year. I think there are some reasons.
Students have too much homework to do, so they have little time to have sports. Some students eat too much junk food. Thats also bad for their health.
Then, how to keep healthy? Here is some useful advice. First, students should do more exercise. Second, students should eat a balanced diet. They should eat more vegetables and fruits, and try to eat less junk food. Finally, enough sleep is also very important.
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