—Simon is watching TV.—He's watching TV? He's ________to be cleaning his room.
You'd better not phone the manager between 7 and 8 tomorrow evening, because he __________ an important meeting then.
—We are going to hold a sports meeting tomorrow. —__________ it rains?
It is reported that the United States uses __________ energy as the whole of Europe.
As a result of the poor environment, many animals have __________.
Once you have become __________ to cigarette smoking or alcohol, it is hard to __________ it even though you try hard.