Maria: Excuse me. Are you Steven Green?

David: 1 ,I'm not. I'm David.

Maria: Oh, I'm sorry.

David: Steven,2this your math(数学)book?

Steven: Oh, yes. It's3.4.What's your5?

Maria: I6Maria.

Steven: Nice to meet7, David, this is Maria.8 is in our class.

David: Hi, Maria!

Maria: Hi, David! Nice to9you.

David: Nice to meet you,10.