根据短文内容，判断下列句子正误。

    It's 5:30 in the afternoon.School is over. It's time for students to relax.
    Look! Some boys are playing soccer and some are playing basketball on the playground(操场). Most girls don't like ball games because they think they are boring. They like to do other sports, such as swimming and dancing.Some girls are swimming in a big swimming pool. In the gym, Maria and her friends are dancing to the music. Some students are singing together in the classroom.Who are they? Oh, they are some students of Class Four. They are cleaning their classroom now. After that, they can play with other students.