--May I smoke here?
--________, you ________. It can be dangerous.
-How do you feel about the air pollution?
-So heavy.It's hard ________ in cars.
--Where can I find Jack?
--He ________ the post office.
What's ________ name?
________Tom.
________ is your English theacher?
Miss Wu is.
-What do you think of the book?
-________.