根据对话内容，在空白处填入恰当的句子，使对话完整、通顺。

A: Hello, I'm Grace. ?

B: My name is Emma．

A: , Emma．

B: Nice to meet you, too．

A: ? I often see you two together(在一起)．

B：No, my sister is Annie．The girl is my friend Lucy．We are in the same class．

A：Oh，I see. ? I want to make friends(结交朋友)with her．

B：It's 7893042．

A：Thank you. I must go now. ．

B：Thank you. You, too．