Do you know where ______now?
Long skirts have been ______ for a long time in the West, but they are coming back this year.
—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.