A、They hired Tom to take care of their house. B、They left their house empty. C、They asked neighbors to look after their house. D

M: (19)I really have no idea what to do during this summer holiday. I can’t bear to just sit around, and there seems to be no jobs available.
W: Why don’t you try house-sitting? (20) Last summer my friend Tom house-sat for the Alexanders when they went away on vacation. Mr. Alexander hired Tom to stay in their house because he didn’t want it left empty.
M: You mean the Alexanders paid Tom just to live in their house?
W: It certainly wasn’t that easy. (21)He had to mow the lawn and water the houseplants and also feed the pets. And when Boris house-sat for Mr. Alexander, he had to help him with his farm.
M: I heard about baby-sitting, and house-sitting sounds just like that—except you’re taking care of a house instead of children. It may be a suitable job for me.
W: The student employment office still has a few jobs posted.
M: Do I just have to fill out an application form?
W: Yes, and Tom and Boris had to interview with the homeowners and provide three references each.
M: That seems like a lot of trouble for a summer job.
W: Well, the homeowners want some guarantee that they can trust the house-sitter. You know, they want to make sure you’re not the type who’ll throw wild parties in their house, or move a group of friends in with you.
M: House-sitters who do that sort of thing probably aren’t paid then.
W: Usually they’re 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. (22)So why don’t you give it a try?
M: (22)Yeah, I think I will do that as soon as possible.
19. What does the man want to do this summer?
20. What did the Alexanders do when they went away on holiday last summer?
21. Which of the following is probably the responsibility of the house-sitter?
22. What will the man probably do after the conversation?