—Will you please make yourself ______ to us, please?—I’m the honorary chairman of the committee.
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
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.