根据图表补全对话，每空词数不限。

A: Where is your classroom, Wu Dong?

B: It's on the second floor. It's next to the .

A: Is the music room on the second floor, too?

B: .

A: have a gym?

B: Yes, we do. It's on the floor.

A: Where is the ?

B: It's under the art room.