【C20】A．answerB．methodC．solutionD．approach

【C18】A．answerB．oppositeC．alternativeD．other

【C18】A．answerB．expressionC．reasonD．effect

【C8】A．wayB．methodC．techniqueD．habit

A．caseB．methodC．mannerD．file

【C7】A．answerB．requestC．questionD．difficulty

【C14】A．answerB．requestC．questionD．difficulty