Teacher Ding, the head teacher, found that Luo Yu had brought her mobile phone to school, and secretly sent a short message during class, intending to talk to her. If you are Miss Ding, you

Students, the purpose of our coming to school is to study. Of course, if you feel tired, you can relax, but don't waste your class time on other unnecessary things, ok? I know you have a mobile phone, and I have no objection. Sometimes you need to keep close contact with your family, but if I find that your grades have dropped during the time when you have a mobile phone, I will limit your right to use it. Do you have any opinions?