假定英语课上老师要求同桌之间交换改作文，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：在错的词下面划一横线，并在该词下面写出修改后的词。
主意：1. 每处错误及修改均限一词。
2. 只允许修改10处，多者（从第11处起）不计分。
Dear Editor,
I am a senior high student. I am writing to share my worries with my classmates.
With the development of IT industry, many of my classmate have 3G mobile phones. It can inform us the latest news, make us relaxing and keep in touch with our friends, but they play computer games, watch movies or chat online after the class, even in class. These has caused them to lose their interested in their lessons. I hoped 3G mobile phones should be banned at school. Do you agree about me?
I am looking forward to your earlier reply.
Yours,
Li Hua