21. (2012·°ö²º¸ß¶þ¼ì²â)He made up_____ excuse to the teacher that he needed to look after his sick mother. Soon it turned out to be _____failure.

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

22. Judging from the smile on her face, we can know that she is in good_____ today.

A. spirit                       B. spirits                             C. minds                      D. heart