21. It is _______ good feeling for people to admire the Shanghai World Expo that gives them _______ pleasure.
A. 不填; a B. a; 不填 C. the; a D. a; the
22. As a result of the serious flood, two-thirds of the buildings in the area _______.
A. need repairing B. needs to repair
C. needs repairing D. need to repair
