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。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(\)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。

Ibelieve we students should allowed to carry cell phones to school because weface many danger today. Cell phones help us to keep in the touch with ourparents and to let them know when they have a problem. Also, if our parentshave to change arrangements they had made with us, they can text us or call us.Some teachers complain for some of us using cell phones in class, and most ofus don't do this. To solve this, schools can just make a rule about not usecell phones in class. Using cell phones are part of modern life and if we usethem sensible, we can carry them to school.