A、Because he can’t find his office key. B、Because he has misplaced some exams. C、Because he’s unable to talk. D、Because he doesn

M: Math department, Doctor Webster speaking.
W: Hello, Professor Webster, this is Janet Hill calling. I live two doors down from your teaching assistant, Don Williams. (1) Don asked me to call you because he has lost his voice and can’t talk to you himself. M: Oh, what a shame! Is there anything I can do for him?
W: Well, he has a class this afternoon from 2:30 to 4:00 and he won’t be able to teach it. But he doesn’t want to cancel it, either.
M: Does he want me to try to find somebody else to teach the class?
W: No, not exactly. What he wants to do is to get someone to go in for him. Just to pass back the mid-term exams. And they are on the desk in his office.
M: His class is at 2:30, you say? Well, I’m free at that time, so I could do it for him. What room is his class in?
W: Cater Hall, Room 214. (2) Will you need his office key to get the exams? He’s given it to me and I could bring it to you.
M: Well, we have another key in the department. So I can get into his office if necessary.
W: Thank you very much, Professor Webster. Don will call you as soon as he can. Oh, yes, I almost forget.
M: Yes?
W: (3) Could you put the next assignment on the board, too? It’s all the problems on Page 45, and they are due at the next class.
M: No trouble at all. And please tell him not to worry about anything.
1. Why is Don unable to teach his class?
2. What does Janet offer to do?
3. What does Janet almost forget to ask Professor Webster?