A: Good morning, Mr. Green.
B: Good morning. Are you Su Hai?
A: No, I'm not. I'm Su Yang. Would you like a sweet, Mr. Green?
B: No, thank you. Don't eat in the library!
A: Sorry, Mr. Green.
B: Are you Mike?
C: Yes, I am.
B: Don't drink here, Mike.
C: I'm sorry.
B: Don't shout, Liu Tao and Wang Bing!
D&E: Sorry, Mr. Green.