1.Don't make noises in class.
2.Don't eat in class.
3.Don't sleep in class.
4.We should listen to the teacher carefully.
5.We should take some notes in class.
6.We can't throw the litter here and there.
7.We should do homework on time.
8.We should clean our classroom every day.
9.We work hard on our study.
10.We should help each other.
