21. Studies show that the things that contribute most to a sense of happiness cannot be bought, such as a good family life, friendship and work _______ .

A. bonus                                                                B. talent

C. affection                                                            D. satisfaction

22. Since World War ¢ò, the authority to ______ war has gradually slipped into the hands of the US president.

A. announce                                                           B. declare

C. conduct                                                                     D. behave