Are you going to Guilin byplane—It’s fast but expensive, so I’mnot sure. I __________ take a train.

You’d better______smoking. It’s bad for your health.

The lights in the classroom are on, but ______ is init．

What’s the matter with you, Sandy?— I’m _____ a bad cold. I think I am dying.

____do you like history- Because it is interesting.