题目内容：

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：在错的词下画一横线，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 Ashley,

You ask me how to protect your eyesight at your last letter. I am writing to give you some suggestion. Firstly, you shouldn’t keep your eyes work for a long time. After you have studied for an hour or so, you’d better to have a rest and look out of window. Secondly, while reading a book, you should keep your eyes about a foot away from them. Thirdly, keep it in mind what you shouldn’t read in poor light, in strongly sunlight, on a moving bus or in bed. Lastly, doing eye exercises every day help you protect your eyesight.

I hope my advice will be of help to you.

Yours,

Li Hua