请将方框中符合对话情境的句子填写在相应的横线上，使对话恢复完整。

OK. Forty-five. It's our computer room. Do you have a music room? And we have music class in it.

A: Hello, Amy! This is our new school. Let's go and see it.

B: Where is your classroom?

A: It's on the first floor.

B:

A: Yes, we do.

B: What is under the music room?

A:

B: How many computers are there in it?

A: