根据短文理解，选择正确答案。

    It's seven forty in the morning. The students are coming into the classroom. A girl is opening the window. Some of the students are laughing and talking. Some others are listening to them. Some are reading books. Some are doing their homework.

    Miss Zhao is standing behind the teacher's desk. She is writing on the blackboard. She and Lily are wearing their new dresses. Ann is cleaning her desk, and Mike is helping her. They all look happy.

    What are Bill and Jim doing? Oh, dear, they are still playing basketball on the playground.