A、He knows more customers than any other employees. B、Only he knows how to get a certain large contract. C、He used to be a manag

W: Come in, come in. Have a seat. Ah, I want you to know this is going to hurt me more than it will hurt you.
M: Yes, madam. But I’m not quite sure what you’re talking about.
W: You’re fired. That’s what I’m talking about.
M: I find that surprising, Miss Jackson. After all, I sold twenty-five percent more of our products than any other salesman. (19)
W: Look, I’m not here to argue. You’re fired. Understand?
M: I understand perfectly. I just wonder what’s going to happen to the contract I’ve been arranging. It would be a shame to lose it; it could mean a lot to our company. And I’m the only one who knows the details. (20)
W: No one is indispensable. Just clear out your desk, and that’s the end of it. Do I make myself clear, Mr. Westlake?
M: Crystal clear — apart from one small detail.
W: And what, pray tell, is that detail?
M: I’m not Mr. Westlake. I’m Carl Smith. (21)
W: Oh...well then, that’s a different kettle of fish, (21) Mr. Smith. I know you’ve been working late almost every night and coming in on Sundays to get your work done. The company is very happy with your progress.
M: That’s good to know. I was beginning to think that I wasn’t appreciated.
W: You are doing well. We have approved your salary increase.
M: That’s great! Thank you! I’ll certainly try to live up to the trust you have demonstrated in me with this raise in pay.
19. Why is the man surprised at being fired?
20. What is the second reason mentioned for the man to object to his being fired?
21. What mistake did the woman make?