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.