21. How much money do you need to be happy? That’s the question ____ by Elizabeth Dunn and Michael Norton in a recent New York Times article..
A. to ask B. asked C. being asked D. asking
22. By the side of the Bird’s Nest _____ , completed in 2008.
A. there standing the Water Cube B. stands the Water Cube
C. does the Water Cube stand D. the Water Cube stands
