They kept trying __________ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |
25．There is an obvious __________ between the cultures of the West and East.
| A．content | B．contrast | C．contract | D．Contact |
24．We have strong __________ for believing that the mine accident in Heilongjiang was due to the poor management.
| A．grounds | B．reason | C．cause | D．Purpose |
23．—Hey, dear! Guess what? I’ve got a pay rise!
—This ________ a celebration! Let’s go to sing karaoke tonight.
| A．calls for | B．works out | C．brings about | D．pays for |
22．I’m terribly sorry to turn you down this time, but I promise I will ________ to you next time.
| A．pick it up | B．make it up | C．turn it up | D．set it up |
21．The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
| A．set off | B．set down | C．set aside | D．set about |