answer: #Person1# wonders why people don't drive cars. #Person2# explains the difficulty of finding parking lots, and it's expensive.
documents: #Person1#: Here we are on the train.
  #Person2#: Yes, we are travelling at rush hours. It could be very crowded in the morning and after 6 o'clock in the afternoon.
  #Person1#: I hear many people have cars.
  #Person2#: Yes, almost all the families have their own cars.
  #Person1#: Why don't they drive? Isn't a car more convenient than the subway?
  #Person2#: Well, it is hard to find a parking place in the city. Besides, parking is quite expensive in the downtown.
  #Person1#: I see.