When the Teacher Wasn't in the Classroom

Yesterday, when the teacher was not in the classroom, most of my classmates became happy, excited and even crazy. They began to talk.

The first talker was Sun Dianbo. He shouted, "We are free!" Then, lots of people started talking. Shang Yuepeng talked with Sun Dianbo, Yao Xinyu, Li Zheng and Zhang Xince although they were far from him. Wei Xueqing and Tan Ruxin had a discussion. Wu Tong and Wang Lin talked about games. Suddenly Sun Dianbo shouted at the door, "The teacher is very bad!" Then, others laughed a lot. They broke the rules and didn't follow the monitor.

When the teacher came into the classroom, they stopped talking at once, but the teacher still found them talking. So the teacher was angry.

But in fact, the same things happen almost every day. I can hardly study. What should I do?