le hasn’t been able to quit smoking, but at least he has.

plane _______ in a minute. Pleasefasten your safety belts and remain on your seats until it has landed,” thestewardess announced in a sweet voice.

They ________ the trucks with boxes of food and sent the goods to the disaster areas in Sichuan province.[ ]

Shall we go out for a walk? —Sorry．I’m too busy to for the moment．

Though computers can do a lot of work man can’t do, they can’t completely________human beings. [ ]