21. He is a man of _______ few words, but his talent in singing is ________ second to none.

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

22. Teachers have to constantly update their knowledge in order to maintain their professional  ________.

A. consequence        B. independence            C. competence                     D. intelligence

23. Because of the money that has been collected by non-benefit performance, the people in the disaster-stricken area ________ their home very soon.

A. will be rebuilding                                    B. will be rebuilt          

C. will have rebuilt                         D. have rebuilt