A、He may not be able to repair the car. B、He may secretly change some parts of the car. C、He may charge the woman more than he s

M: What’s the matter? Aren’t you feeling well?
W: Well, I’ve been really worried. It’s my car. It’s in the repair shop again!
M: Really? What’s wrong this time?
W: I don’t know exactly. Something has gone wrong with the brakes I think.
M: Well, at least that shouldn’t cost too much to fix. Parts are cheaper for old American cars like yours. Did the mechanic say how much it would cost?
W: He said he’d call me with an estimate later on today.
M: Watch out he doesn’t try to take advantage of you.
W: What do you mean?
M: Well, some car mechanics, if they think that someone doesn’t know much about cars, they might try to overcharge that person.
W: Maybe so, but I trust this guy. He was recommended by one of my neighbors.
He’s done some work for me in the past and his prices seemed to be reasonable.
M: Oh, that’s good to know. Maybe I’ll try using him in the future.[21]By the way did you need a ride home after class today?
W: Oh, I’ll sure appreciate it. It’s really tough getting around without a car when you live off campus.
19. What can we learn about the woman’s car?
20. What does the man warn the woman about the mechanic?
21. What does the man offer to do at the end of the conversation?