-- Do you enjoy ______ here?-- Oh, yes, the air, the green hill, the thickly trees. Everything is so attractive.
Our monitor talks about Mars as if he ______ a scientist.
Your floor is dirty. It needs _______.
. ---Here you go. There are______ such cards here. --- I only need ______ these cards in the box.
---Listen! The fire engine is roaring! (消防车吼叫) --- Oh, there ______ be a fire somewhere. How terrible!
The robber can’t escape _______ this time. We have got much evidence to prove his crime.