A、They prevent from traffic jam. B、They make travel convenient. C、They improve the service standard. D、They design terrific sche

W:(19)Sorry, I’m late. The train was delayed. I got stuck on the platform for about 20 minutes.
M: Yeah, it happens from time to time. How are you finding the commuting anyway?
W: Well, it’s a shock to the system to be honest. Last night I was coming home from the office, and I got caught in the mad jam. It was unbelievable that everyone seemed jammed in a can.
M: Yeah, and then just when you think there is no way anyone else could fit on, five more people burst in!
W:(20)I’ve got to hand it to the train companies though. Whoever devised the schedules is a genius. It’s amazing how different trains arrive at the same time for people to change.
M: I know. Back home, 20 minutes late for a train is pretty standard!
W: So what do you do to take your mind off things on the train? I sometimes try to read a book, but I can’t turn the page, not enough space!
M:(21)I usually listen to music, and it helps block out everything. But if I’m really tired, I tend to just nod off for a few minutes.
W: Isn’t that a bit risky? You don’t want to miss your stop.
M: You watch the businessmen do it. They have it down to an art form. They will wake up just before their stop.
W: I’m afraid if I close my eyes, I won’t be waking up so quickly!
19. Why is the woman late?
20. Why does the woman speak highly of the train companies?
21. How does the man usually spend time on the train?