Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.
On receiving the admission letter from Harvard University,that he stood for quite a while speechless.
We writing a letter of complaint to the manager himself.But we'd like to hear your opinion first.
—How long do you suppose it is he arrived here? —A week or so.
When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival.
—Hey, did you enjoy the vacation in London? —No.Our vacation was totally ruined; not only was the food terrible but the weather was awful .