题目内容：

假如英语课上老师要求同桌之间交换修改作文，请你修改你同桌的以下作文。文中共有10处错误，每句中最多有两处。错误涉及单词的增加、删除或修改。

增加：在缺词处加一个漏词符号∧，并在此符号下面写出该加的词。

删除：把多余的词用斜线＼划掉。

修改：在错词下面划一横线，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。

Nowadays, many teenagers spend too many time on computers. The number of students who come to school in the morning are already completely exhausting. The cause of this is staying late at night playing computer games and chat with their friends online. Most of them don’t realize just how damaging to their healthy this is, let alone the effect it has on their grades. I recently read an article about the damage that playing computer games are doing to kids. The article claimed for that lots of the games kids play are extremely harmful. It said that at best they are turning teens into dull people which have no social life and at worst into potential killer!