选择合适的句子，把对话补充完整，将字母编号填在横线上。

A: Welcome to my school.
B: Oh, it’s very nice and big. _________________________
A: We have twenty classrooms.
B: ______________________________
A: A computer room, a library (图书馆), a music room (音乐室), an art room (绘画室) and sixteen classrooms.
B: Is this your classroom?
A:______________________________
B: Do you have a computer in it?
A: ______________________________
B: ______________________________
A: Yes, I do.