21. Living in _______ ever increasingly fast-paced world, we are facing greater competition, so we must take _______ advantage of every opportunity to develop.

A. an; the                       B. an; ²»Ìî                  C. the; an                     D. the; ²»Ìî

22. I am _______ about what I say because careless remarks are likely to hurt others’ feelings.

A. enthusiastic                B. concerned                 C. doubtful            D. cautious