单项选择题

M: You don’t look very happy. What seems to be the problem
W: I’ve got to write a long composition for my English class, and I just can’t come up with any ideas, and it is due tomorrow.
M: That shouldn’t be. too difficult. Remember those pictures you were showing me last week
W: Sure.
M: Why don’t you write something about the camel ride you took
W: That sounds like a good idea. I can also write about our visit to the North Africa.
M: Well, now that you’re feeling better, I think I’ll be on my way. I’ve got to finish my composition too.
W: Thanks for your help. I’m much more relaxed now and once I get organized, it won’t be so difficult.

Why does the man have to leave()