May I speak to your manager at four o’clock thisafternoon–I’m sorry. He ________ to a conference long beforethen.

____ it rain tomorrow, I’d stay at home.

The trip shouldn’t take more than one hour.- ______. It is at least two hours.

There serious air pollution if people use more and more cars.

d a computer at home, and her parents desiredthat she _____all her work at home.