A、Mark the latest homework assignment. B、Tell the students the class is cancelled. C、Make an appointment with a doctor. D、Return

M: Math Department, Doctor Webster speaking.
W: Hello, Prof. Webster. This is Janet Hill speaking. I live two doors down from your teaching assistant-Don Williams. Don asked me to call you because he has lost his voice and can’t talk to you himself.
M: I’m sorry to hear that. Is there anything I can do for him?
W: He has a class this afternoon from 2:30 to 4:00 but he won’t be able to give it, and he doesn’t want to cancel it.
M: Does he want me to give the class?
W: No. He just wants someone to give back the mid-term exam papers. He’s already marked them and they are on his office table.
M’ His classes are at 2:30, right? Well, I think I could do it for him. Which room is his class in?
W: Yes. Cater Hall, Room 224. Do you need his office key to get the papers? He’s given it to me and I could bring it to you.
M: Oh, that’s not necessary. We have a master key in the Math Department.
W: Thank you, Prof. Webster. Oh, yes, I almost forgot.
M: Yes?
W: Could you put the next assignment on the board, too? It’s all the questions on page 45, and they are due at the next class.
M: OK. Thanks for passing on the news about Don, and please tell Don not to worry about anything.