The bell rang after class. The students on duty stayed in the classroom. Not all the students on duty went out to play.
Some of the students on duty sweep the floor, some clean the table, some clean the blackboard. Xiaohong waves the broom to sweep the floor conscientiously. Xiao Lan is cleaning the table one by one. Xiao Ming picked up a rag and stood in front of the blackboard. He felt that he could not reach the blackboard. He turned his eyes and saw a stool beside him. He could reach it when standing on the stool. He was such a smart boy. They are doing a lot of work.