What do you usually do after class? When class is over, most students in my class go out of the classroom. We have twenty 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 is trying to stop him. They are so cool. And there are some girls watching the match. Some students are still in the classroom. They are talking. A few of them are reading and doing homework. Look! A girl is looking at the birds in a tree in front of the classroom. She must be thinking of something interesting because she is smiling. What are the teachers doing? Do you know? Some of them are doing work in the office, and some are talking with students. Everyone is busy with his or her things, busy and happy! A girl is looking at the birds. She is   _  .
happy. not happy in a tree watching the match