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. Fitness is important in sports, but of at least ________ importance are skills.

A. fair              B. reasonable             C. proper       D. equal

23. It’s not ____books you read but the way _____ you read them that decides how successfully you gain knowledge.

A£®the number of ; /                B£®a number of ; in which

C£®a good many ; which          D£®quite a few ; in which