A、Since he found a girlfriend. B、Since he took to heavy smoking. C、Since he began to exercise regularly. D、Since he started to l

W: I’m so worried about Mark these days. Ever since he moved into his apartment, he has been losing weight. He really doesn’t look well at all.
M: He should try to gain some weight. He is probably not eating enough.
W: Well, anyway, how is Tim these days?
M: Tim? Oh, Tim has been worried, too. He is really getting much too fat. He needs to lose about 75 pounds now.
W: That’s a lot of weight to lose. What does Tim eat?
M: I really don’t know. But I am sure he is eating too much cake and candy.
W: Well, did I tell you Mark doesn’t eat any meat now? He only eats vegetables and fruit.
M: That’s probably why he is so thin. Does he smoke?
W: Does he smoke? About two packs of cigarettes a day. That’s my son, a smoking vegetarian.
M: En, if he stops smoking, he would gain weight. I know he would. Tim put on a lot of weight when he stopped smoking.
W: Does Tim play any sports?
M: Play sports? Oh. my! I keep telling him, "Tim, dear, you really need to get some exercise." And you know what he does? He just gets angry.
W: I know Mark doesn’t take exercise, either.
M: Did you tell him?
W: Of course, but you know what it is like being a mother of a 13-year-old boy. They just don’t think they need your advice anymore. I wish Mark could find a nice girlfriend to relax and have fun with. I heard Tim has a girlfriend at last. That’s wonderful.
12. When did Mark start losing weight according to the woman?
13. Why is the man worried about Tim?
14. What did Mark and Tim have in common?
15. What is the woman’s wish for Mark?