看图，完成对话。
A: Look at this ______ .
B: It's nice, but it's ______ ______ .
A: Yes, guess, ______ ______ is this?
B: Perhaps ______ your sister's.
看图，完成对话。
A: Look at this ______ .
B: It's nice, but it's ______ ______ .
A: Yes, guess, ______ ______ is this?
B: Perhaps ______ your sister's.
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