A、A Teaching Skills summer course. B、Summer camping. C、Going cycling. D、Going windsurfing. A对话一开始，女士就点明了谈话的主题，即关于教学技能暑期培训班(Teach

W: Hi, Bob, (19) I hear you’re running the Teaching Skills Summer Course. I might be interested in coming along if that’s OK, but I’m not sure if I’ll be able to make it every day.
M: Yes, it was such a big success last year that we’re doing it again.  It’s a lot less intensive this time, though, so you might be able to come along to most of the sessions.
W: Can you give me the details, then? I hear it starts on Tuesday the 2nd.
M: Well, actually the teachers are arriving on that day. Things get under way the day after. The induction session is on the first Wednesday.
W: Excellent! Can I come along to that?
M: Oh, definitely—it’s a good idea, actually, because you get to know everyone before they start to form mini-cliques and hang out with the same people for the rest of the course.
W: That’s just like our students!
M: Oh yeah, maybe we don’t change that much after school after all. Anyway, on Thursday we have the first set of seminars, which are my favorite sessions. (20) There’s nothing scheduled on Fridays, so a lot of people do their own things, mostly prepare for the next session. Some of them went cycling last year, and two guys went windsurfing.
W: Nice. I’m busy on Fridays. What about the weekends?
M: (21) Well, on the 6th, there’s the session called "Teaching". We put the teachers in groups and they have to come up with a great lesson. It’s sort of taking you back to your teacher training days. You can come along to watch that—you could criticize some of the lessons if you like.
W: No problem. What about the next Saturday? Is there teaching then, too?
M: No, although that’s a pretty good idea for next year. No, on the 13th, we’ve got more seminars.
W: When does everyone leave?
M: People leave on Monday, (22) because there’s always such a good party on Sunday 14th, so they sleep it off, and then leave the next day.
Questions:19. What are the two speakers mainly talking about?
20.Which one of the following schedules is right?
21.What do teachers do with the "Teaching" session?
22.When will the teachers leave?