请改正下列短文中的错误。
A science theory is the result of a science method. __________
Scientists look at the world and try to describe and explain how they see. First, they observe what they    __________
are interested in careful. To explain what they have seen, __________
they build a theory about the way which things   __________
happened and whether it can predict future events. If what  __________
they are observing can be tested on a practical way, __________
scientists will use experiments. But if, as Hawking, they  __________
are studying something which is too large or too difficult to _________
observe directly, they will use a model to test the theory.
People who listen to Hawking's lecture sometimes find this _________
difficult to understand him, because his thoughts and ideas
often seem as large as the universe he is trying describe.  __________