A、Because he is always in trouble at home. B、Because he won’t live with his parents. C、Because he often fights with other person

W: Do you think families have changed much in the last 50 years?
M: I think families everywhere have changed a lot in the last five decades.
W: What do you think is the biggest change?
M: (19)Well, in the past, three or four generations would live together under the same roof. Nowadays, relatives living in the same city become rare.
W: That’s true. You know, some husbands and wives don’t even live in the same city any more.
M: Would you ever consider having your parents live with you when they get older?
W: (20)I guess I’m a bit old-fashioned. I’d rather have my parents live with me than live in a retirement room.
M: (21)That’s very respectable, but I could never live with my parents. I usually only see them at our Christmas celebration and that’s enough!
W: How about your other siblings? Do they spend a lot of time with your parents?
M: Two of my sisters still live at home, even they have already graduated from university and have jobs. (21)They enjoy spending their free time with my parents. I guess in that respect, I’m the black sheep of the family.
W: I see. Do your parents ever ask you to come home to visit them more often?
M: (22)They’re always asking me to come home, but I think our relationship is better if we keep a distance from each other. Whenever we see each other, all we do is fight.
W: Well, you know what they say, "you can choose your friends, but not your family."
19. What does the man think is the biggest change in family?
20. What does the woman wish when her parents get older?
21. Why does the man say he is the black sheep of the family?
22. Why is the man unwilling to live with his parents?