I can’t remember ________ made the teacher give Mary the permission to leave the class earlier.
We didn't know his telephone number, otherwise we _________ him.
It was essential that the application forms ___________ back before the deadline .
_____________ 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.