answer: Steven tells #Person1# he goes cycling every Saturday. Steven chose cycling because it's convenient and environment-friendly.
documents: #Person1#: Hi, Steven! What do you like to do during the weekend?
  #Person2#: I love swimming and cycling. On Saturday morning I usually ride my bike around the city or the country road for almost two hours.
  #Person1#: That's great! I think they do you a lot of good.
  #Person2#: Sure, they do.
  #Person1#: But why do you choose cycling at first?
  #Person2#: Because it is convenient and good for environmental protection.
  #Person1#: You are really a good citizen.
  #Person2#: That's what I can do.