---- Don't you think it necessary that he _______ to Miami but to New York?---- I agree, but the problem is ________ he has refused to.
_____________ cease(终止) advertising, prices would be significantly reduced.
Much labor would have been saved if the electronic computers_____________ before.
There was a(n)________silence in the live interview,when no one knew what to say to the audience.
Doctors are doing research to find out what happens physically when people______ smoking.
Once you get _______ something, it is very hard to ________.