.With Shanghai World Expo drawing near, volunteers are making use of every minute to _______ their foreign language because language volunteers must pass a written test and an interview.
Environmental experts point out that ______ some serious problems such as global warming, but it also could threaten human life.
—I heard that Mr. Smith has become a triathlete. —Oh, really? He has become ______ he wanted to be.
China Mobile, which has cut its charges in recent years, is desperate to find new income sources ______ its traditional services.
The stars are so hot that they ______ great light and heat — more than the hottest, brightest fire you can imagine.
The Prime Minister criticized some celebrities for their ______ attitude towards drugs and accused them of thinking they were “above the law”.