My father’s new cell phone can be used _________ e-mails. But he says he isn’t used ________ on such a small screen.

Shall we meet at the station at 8 a.m ——-In fact we________.The train_______until 10a.m.

The question that puzzled them is ____ they can getrid of the air pollution in the area.

I’m very proud of that Beijing is one of __________cities in the world.

The manager needs an assistant that he can _____ to take care of problems in his absence.