M: In just three weeks, and I am excited. I have been longing for the trip. But there are still a few things needed to be done before I go.
M: I must have my passport renewed and go to the travel agency to confirm something about the time schedule of the trip and the plane ticket. (23)But the trouble is how to do with my apartment while I am gone.
W: You are not going to give it up, are you？
M: (24)No way, I’ll never find another apartment around here, but I don’t like the idea of paying three months rent on an empty apartment, either.
W: I don't blame you. Perhaps you could rent it to someone else.
M: Yes, but to whom？
W: Mm, let me see, Oh, I know, an old colleague of mine, Jim Thomas, who is coming here to do some research this summer, from June to August.
M: That's exactly when I'll be away. (25)It sounds ideal, as long as the landlord agrees.
W: Yeah, you may first tell the landlord. I'll be calling Jim late this week anyway, so I'll mention it to him then.
M: Well, thanks, Bill. Let me know what happens.
(20)

A. He can not find the plane ticket.
B. His passport is not available then.
C. His time schedule is not suitable.
D. He does not know how to do with the empty apartment.