You have different kinds of rules at school. As students, you have know he rules fret and must follow them. You can't bring food to the classroom. Because the classroom is place for you to study. And you can't study well when someone is eating. But you drink water in the classroom. It's good your health. Don' t run or play sports in the classroom. It's dangerous. You may get hurt. Don't listen to music in the classroom. And important for students lo study in a quiet place. Don T leave your rubbish(垃圾)under your desk. That will make the classroom dirty.