A、Doctor and patient. B、Secretary and visitor. C、Manager and clerk. D、Teacher and student. B

W: Welcome, Mr. Johnson. Take a scat, please. Our manager will be back soon.
M: Thank you. Urn, it’s rather warm these days, isn’t it?
W: Yes. The weather is quite unusual at this time of year.
M: You’re fight. Er ... do you mind if I take off my jacket?
W: Sure. Make yourself at home.
M: Thank you, that’s better. Um ... do you mind if I smoke? I notice nobody’s smoking around here.
W: Well, I’m sorry, but this is a non-smoking office building.
M: Oh, that’s OK. I’m trying to quit it anyway. By the way, may I use your phone to book a table ... for lunch?
W: Yeah. Sure. Do you know which restaurant is good?
M: Oh, yeah, absolutely.
W: Fine. The phone is over there.
M: Thank you.