未知题型 The less you rely on pain killers now, the better it will be for your health ________.A in the long runB after allC all too oftenD for the time being

未知题型 We should see the events in their historical ________ before we draw any conclusion.A respectiveB retrospectiveC prospectiveD perspective

未知题型 Lack of confidence is the biggest ________ to his success.A barrierB obstacleC flawD drawback