单选题 It is legally possible for an elderly person to _______ someone to act for them, should they become incapable of looking after themselves.

单选题 He knows that the _______of status can consume vast amounts of people’s time and efforts.

单选题 The doctors are at a loss because so far no medicine has been found to _____ the spread of the disease.

单选题 Do you think the teenagers there have ______from the cultural values of their forefathers?

单选题 In spite of all your _______, there may be times when you encounter difficulties in the training process.

单选题 The potential spread of weapons of mass destruction continues to cast a shadow over the ________ of peace.

单选题 We see many special education directors trying to ______the quality of their programs with much less money and much smaller staff.

单选题 Darwin’s thinking both drew upon and ______ the conventional ideas of his time.