重新给下列句子排序，使其成为一段完整的对话。

A: Goodbye.

B: Thank you. Goodbye.

C: Is it your notebook?

D: B－A－C－K－P－A－C－K.

E: Oh, it's a backpack.

F: By the way (顺便问一下), what's that in English?

G: How do you spell backpack?

H: Hi, Sam. Is this a notebook?

I: Yes, it is.

J: Yes, it is mine.

1.              2.             3.             4.               5.            

6.              7.             8.              9.               10.