下面对话中划线部分有误，请将对话修改正确。{#blank#}1{#/blank#}A: There is our school.
B: What's at your school?
A: There are a music room, an art room and a hell.
B: Do you have playground?
A: Of course. We have a big one.
B: How much classrooms are there?
A: There are twenty classroom.
