—Would you mind giving your advice on how to improve our efficiency?
—If you make _____ most of forty-five minutes classes day after day, there will be _____ switch in grades.
| A．/; / | B．the; a | C．/; a | D．the; / |
---He should have been warned of the danger.
---_______, but he wouldn’t listen to me.
| A．So he had | B．So had he | C．So was he | D．So he was |
The teacher asked the two students to discuss the question in a low voice ________ they should bother the others.
| A．so that | B．in case | C．in order that | D．now that |
It was in the lab ___was taken charge of by our teacher____ they did the experiment.
| A．which; that | B．where; which | C．which; where | D．that; where |
Though ________ in San Francisco, Dave Mitchell had always preferred to record the plain facts of small-town life.
| A．raised | B．grown | C．developed | D．cultivated |
At the age of twenty Steve left his hometown, _____ to return without making his mark.
| A．determining not | B．not determined | C．determined not | D．not determining |