假如你是李华，是一名高中生。请你用英语给报社写一封信，反映如

假如你是李华，是一名高中生。请你用英语给报社写一封信，反映如下情况和你的想法：

（1）教室是学生学习的地方，需要安静。

（2）有些学生把手机带进教室，在课堂上经常听见手机的铃声。

（3）有的同学还在课堂上发信息，浪费宝贵的学习时间。

（4）建议有手机的同学上课时把手机关掉，不要接听电话或发短信，应集中注意力学习。

要求：（1）100字左右；

　　（2）参考词汇：集中（注意力）concentrate on.

Dear Editor,

I’m a high school student. In my opinion, the classroom is a place for us students to learn our lessons. We should keep quiet in the classroom. But recently some students bring their mobile phones to the classroom without turning them off, so sometimes we can hear the mobile phones ringing in class. Some of them even waste precious time in class typing short messages. It has affected the other students. In order to make a quiet place for us all, I suggest that those with mobile phones should not talk on the phone or send short messages in class. They should turn them off. And we are supposed to concentrate on our studies.

    Best wishes！

                                                      Yours sincerely,

                                                              Li Hua