answer: Tom's mother thinks Tom wastes time surfing the Internet. Tom explains he's doing homework online. Then, Tom teaches his mother how to find information and go shopping online.
documents: #Person1#: Tom, why are you surfing the net again? It's a real waste of time I've told you.
  #Person2#: I'm doing my homework, mom. I need to write a paper and I'm looking for the information on the net.
  #Person1#: Really?
  #Person2#: Yes. You see, you can find a lot of information by entering the keywords and searching for them.
  #Person1#: That's fantastic.
  #Person2#: And the net can also help you do shopping. It's called e-shopping.
  #Person1#: How can I do shopping without going to the shops?
  #Person2#: It's easy. First, you log on to an online shopping delivery service, which will give you the pictures of different goods. Then you simply point and click around the screen for the goods you want. The goods will be sent to you.
  #Person1#: I can't believe it. Let me have a try.
  #Person2#: It can save you a lot of time.