. His success was because of ________ he had been working hard.
So absorbed ________ in the research that she didn’t hear someone knocking at the door.
______ you do the experiment carefully, you would make discoveries others wouldn’t make.
We had to the match as the ground was too wet to play on.
It was 1995 __________ we began to develop the new computer system.
He is _________ to have gone abroad,for I haven’t seen him for weeks.