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根据句意或提示补全对话。
A: Tom, this my brother, Jim.
B: old are you, Jim?
C: I am seven old. What about you?
B: I am (9). Today is my birthday.
C: birthday!
B: Thank you.
A: Tom, this my brother, Jim.
B: old are you, Jim?
C: I am seven old. What about you?
B: I am (9). Today is my birthday.
C: birthday!
B: Thank you.