21. In order to gain ______ bigger share in the international market, many state-run companies are striving ______ their products more competitive.

   A. a; to make     B. the; making     C. a; to have made     D. the; having made

22. ______ to take this adventure course will certainly learn a lot of useful skills.

    A. Brave enough students                          B. Enough brave students

    C. Students brave enough                          D. Students enough brave