Dear Mr. President: Hello, I am writing this letter to you of the reasons for yes. Recently, more and more school students to use their phones and put it to the classroom. Class can always hear the beep that affected the students will also disrupt the attention of the teacher teaching ideas and the examination of students in the United States has become a tool for cheating so I think schools should take some measures in the study and the time for the start-up mobile phone ban We learn to create a good learning environment
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