out my sister, zhang li. she always watches tv or reads books in her free time. she doesn’t like going out to exercise. i’m afraid that she will be not strong enough. could you write to her to tell her the importance of doing exercise and give her some advice?
a worried sister
dear zhang li,
your sister is worried about you very much. because you don’t take any exercise in spare time. i think health is very important to us teenagers. either study or work is based on strong body. doing sports every day helps us keep healthy and energetic. if we don't take any exercise, we may feel tired and get sick easily. so you should go out instead of staying at home. there are many kinds of sports you can do, such as running, swimming and ball games. just remember "exercise one hour a day, keep illness away."
good luck!
yours,
li fei
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