21. What       fun it is to walk alone with       full moon hanging in the sky.

       A. /; a                       B. a; /                       C. the; /                    D. a ;the

22. The 2010 Shanghai World Expo _______, and we should get into our preparation.

A. approaches        B. is approaching   C. approached             D. has approached

23. Take this box and _______ you can find enough space.

    A. put it which                  B. put up it which place

    C. put it wherever             D. put it in where