Lucy： What (1)______do you study?
Tom： We studyChinese, English-Math and so on.
Lucy： What subject are you (2)______in?
Tom： I'm interested in skill-training classes.
Lucy： Why do you like them?
Tom： (3)______ I can learn useful skills.
Lucy： What’s your favorite (4)______?
Tom： 1 like swimming best. What’s yours?
Lucy： Running. I don't like swimming.
Tom： Why?
Lucy： Because I think it is (5)______.