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.