A、Go to summer school. B、Take a vacation. C、Stay at home. D、Earn some money. D男士说不能只是闲着(sit around)，但又没有现成的工作(jobs available)，说明

M: I really don’t know what to do this summer. I can’t afford to just sit around, and there don’t seem to be any jobs available.
W: Why don’t you try house-sitting? Last summer my friend Margaret house-sat for the Dodds when they went away on vacation. Mr. Dodd hired Margaret to stay in their house because he didn’t want it left empty.
M: You mean the Dodds paid Margaret just to live in their house?
W: It wasn’t that easy. She had to mow and water the houseplants. And when Eric house-sat for Mr. Cohen, he had to take care of his pets.
M: House-sitting sounds like a good job. I guess it’s a little like baby-sitting—except you’re taking care of a house instead of children.
W: The student employment office still has a few jobs posted.
M: Do I just have to fill out an application?
W: Margaret and Eric had to interview with the house owners and provide three references each.
M: That seems like a lot of trouble for a summer job.
W: The house owners want some guarantee that they can trust the house-sitters. You know, they want to make sure you’re not the type who will throw wild parties in their house, or move groups of friends in with you.
M: House-sitters who do that sort of things probably aren’t paid then.
W: Usually they are paid anyway just because the homeowners don’t want to make a fuss. But if the homeowner reported it, then the house-sitter wouldn’t be able to get another job. So, why don’t you apply?
13. What does the man want to do this summer?
14. What did the Dodds do when they went away last summer?
15. How do homeowners determine the reliability of a house-sitter?