How can you possibly miss the news？ It _______ on TV all day long.
| A．has been | B．had been | C．was | D．will be |
So absorbed ________ in the research that she didn’t hear someone knocking at the door.
| A．she did | B．did she | C．she was | D．was she |
______ you do the experiment carefully, you would make discoveries others wouldn’t make.
| A．Should | B．Would | C．Could | D．Might |
We had to the match as the ground was too wet to play on.
| A．call off | B．call up | C．call out | D．call for |
It was 1995 __________ we began to develop the new computer system.
| A．when | B．which | C．since | D．that |
He is _________ to have gone abroad,for I haven’t seen him for weeks.
| A．possible | B．likely | C．probable | D．certainly |