假如你叫李华,是一位高中生.用英语给某报社写一封信,反映如下情况和你的想法：1.教室是学生学习的地方2.有些学生把手机带进教室,在课堂上经常听到手机的铃声.3.有的同学还在课堂上发短信,浪费宝贵的时间.4.建议有手机的同学上课时应把手机关掉,不要接听或发短信,集中注意力学习

Dear editor,
I'm writting to tell you something about students using mobile phones.
In my opinion, classroom is a place for students to study. Some students carry their cellphones into the classroom, and we hear them rings in class sometimes. There are also someone sending messages in class; it is a behavior of wasting their time. We should suggest the students owning cellphones to turn off their phones in class and not to receive calls or send messages, in order to pay their attention on study.