21.Olympics chiefs have thought highly of ________ city's preparations, and its showpiece stadiums the Bird's Nest and Water Cube have drawn________wide praise.

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

22. The company is ready to meet the ________ of the next few years when the financial crisis has not been over yet.

A.enquiries  B.challenges  C.constructions  D.movements.