It was Lin Lin's turn to clean the classroom. He worked very hard. In a few minutes he finished cleaning. After cleaning he was going to play games. When he saw nobody was there，he put the rubbish around the corner. He didn't put it in the dustbin. He thought he was lucky because no one saw him.
Just then, his class master came. He saw what Lin Lin was doing. He told him to clean the rubbish at once. Lin Lin knew he was wrong. He collected the rubbish and put it in the dustbin.
注释:
1) It was Lin Lin's turn to clean the classroom.轮到林林打扫教室。
2) in a few minutes几分钟后
3) finish cleaning完成打扫工作
4) put the rubbish around the corner把垃圾倒在角落
5)just then就在那时候