What do you usually do after class? When class is over , most students in my class go out of the classroom, We have 20 minutes' rest between classes. Look! Most of us are playing during the rest time. Some students are on the playground . They are having a basketball match. Oh, a boy is running with a ball and another boy is trying to stop him. They are so cool. And some girls are watching the match. Some students are still in the classroom. They are talking. A few of them are reading and doing homework. A girl is looking at the birds in the trees, and she has a _ on her face. She is very happy. Where are the teachers? Some of them are working in the office, and some are talking with students. We are all busy  and happy. The teachers are  _  .
working or talking with students having a basketball match reading newspapers playing with the students