--- Who__________ it be that is knocking at the door? --- It ____________ be Father, but I’m not sure.
—Cheap food means that everyone can afford to eat well. —___.But what about the long-term effect on the environment?
—Jane, I will graduate this June.What advice will you give me? —Suggest you goyou are most needed and you'll benefit a lot from it.
—Sorry, sir.He ____to a meeting soon.
The research showed beyond that smoking contributes to heart disease.
That art center is ____ used to be a factory,_____ millions of cars were made.