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How nice to hear from you!In your letter you (ask改成asked) me how to keep healthy.I would like to give you some (advices改成advice).As you know,food is very important to us teenagers.(While改成Since) we grow very fast,we need many things,such as fresh fruit (or改成and) vegetables,fish and meat.But I think you had better not (eating改成eat) food with much sugar or fat.And you should get (去掉a) plenty of sleep.It is necessary (of改成for) you to have at least eight hours of sleep every day.(However改成Besides),you should take physical exercise regularly,(that改成which) will be good for your health.Only in this way (加入can) you keep fit.