21. We have every reason to believe that ______ 2010 World Expo in Shanghai will be ______ success.
A. /; a B. the; / C. the; a D. a; a
22._____________ he used to go skiing in winter but now swimming is his favorite.
A. At a time B. At one time C. At no time D. At times
23.We thought of selling this old furniture, but we’ve decided to ______it. It might be valuable.
A. look after B. keep up with C. turn to D. hold on to
24. Why? I have nothing to confess. _______ you want me to say?
A. What is it that B. What it is that C. How is it that D. How it is that
