阅读短文并判断。

    It's four o'clock in the afternoon. Miss White and her students are all in the classroom.They aren't having a class. They are cleaning the classroom now. Look, Miss White is cleaning the blackboard .Wu Wei is sweeping the floor. What is Chen Yu doing? Look, she is cleaning the windows with Amy. Zhang Peng is very tall, so he is cleaning the door. Mr Black is helping him.Now the classroom is clean and bright. They are tired ,but they are very happy.