根据对话内容, 在每个空白处填入一个适当的句子, 使对话完整、合乎情境。
A:____?
B:No. It is a photo of my uncle's family.
A:____?
B:They are in London.
A:____?
B:Yes. My cousin's name is Cui Tong.
A:____?
B:Thirteen.
A:____ ?
B:No. he is in Grade 8. But the girl is in Grade 7.
A:Oh. I see. She is his sister