Everyone should obey the following class rules:每个同学都必须遵守以下班规：1.No sleep in the class上课不准睡觉；2.Don't listen to music during the class上课不听音乐；3.No talking freely不准自由讲话；...多一点4. Listen attentively.5. Don't play you cell phone in the class.6. Respect your teachers.7. Ask for leave politely if you have to go out during the class.