21. The film star wore dark glasses so that no one would ___________ him.

     A. know      B. reach     C. recognize    D. realize

22. You have no idea how she finished the relay race ________ her foot wounded so much.

    A. for       B. when      C. while         D. with

23. Mrs Smith warned her daughter _________after drinking.

     A. never to drive    B. to never drive   C. never drinking    D. never drive