假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。
文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号（＾），并在其下面写出该加的词。
删除：把多余的词用斜线〔\〕划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从第11处起）不计分。
Dear Jenny:
How nice to hear of you! In your letter you asked me how to keep healthy. I would like to give you some advices.
As we all know, foods like fish, fresh fruit and vegetables is necessary for our body. And you should not eat too many meat. Instead of study all the time, you should take physical exercise as regular as possible. For example, you can play basketball or swim after the school. What’s more, have enough sleep is very important. So I advise you have at least eight hours of sleep every day but not to stay up too late. Only in this way can we keep healthy.
Yours,
Li Hua