answer: #Person1# and #Person2# find they are in the same class. The textbook is expensive, so they decide to share the cost and use the textbook together.
documents: #Person1#: Excuse me, are you going to buy that textbook?
  #Person2#: Well, yeah, I need it for a class. But it's awfully expensive.
  #Person1#: Oh, we must be in the same class! Civil engineering?
  #Person2#: Yes, that's the one!
  #Person1#: Were you there last Friday for the first class?
  #Person2#: Yes. I only moved here last Monday, and I registered for the class last Tuesday. By the way, I thought Professor Qian really seemed to know his subject.
  #Person1#: Yes, his courses are always fantastic, except that he is very strict with his students. Hey, I've got an idea! Why don't we share the cost and use the textbook together?
  #Person2#: Sounds great. Then let's sit together next class.
  #Person1#: Sure. Let's pay for it.