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.