单项选择题
People's confidence in Blair was greatly ______ by his wife's misbehavior.
单项选择题 Smith failed to ______ for the deficit in the company's hank balance.
单项选择题 Difficult as it is, English study is in the long run ______ to a learner in his or her career development.
单项选择题 Cigarette smoking is a great health ______ and may lead to fatal diseases.
