Li Hua found that some students played with mobile phones in class recently, and they often heard cell phone ringing and sent text messages in class, so he gave two suggestions to the headmaster.

Hello, dear headmaster, according to a recent study on the situation of our school, I tell you to make two suggestions.

1. I often hear the sound of "electric mosquito coil incense" in class, which is so annoying. In order not to affect the students' class, please ask the principal to spray some pesticides on them.

There is a keyboard sound in the classroom. In order to prevent students from overworking, please comfort the principals!