A: Here we are on the subway.M: Yes, we are travelling in rush hours. It could be very crowded in the ___________ and after 6o’clock in the afternoon.A: I heard that many people ____________.M: Yes, many families have their own cars.A: Why don’t they drive? Isn’t a car more convenient than the subway?M: Well, it is _______ to find a parking place in the city. Besides, parking is expensive in the downtown.A: I see. I saw many public bicycles ___________ the subway station. I think we can go back homeby bike ____________.M: OK. Bike riding will help us do some exercise. And we won’t have to worry about traffic jamafter getting off work.