根据对话中的情景，使对话内容完整。
A: How are you, Dale?
B : I'm fine, __1__ you.
A: What's this in English, Dale?
B: It's a __2__ 
A: Is it your family photo?
B: __3__ , it is.
A: It's a nice photo.
B : Thanks.
A: Who is the __4__? 
B: She is my sister.
A: Is Nick your __5__?
B: No, he is Mary's brother.
A: OK. Let's go and meet him.

The girl________ is talking to Lily is my sister.    

—________ is she?      
—She is my sister.