—There was thick haze(雾霾)in our city this spring.What do you think of it?—I think________cars we drive,________pollution our city will have.
--Will Tom come to our party? --______I’m not sure.
They were all very tired, but ______of them took a rest.
After the hard work, what we want is ______a rest.
You _____keep the water running all the time, because you’re wasting water.
--Ann has finished her homework, hasn’t she? --Yes. She ______it an hour ago.