A．ThereforeB．HoweverC．SoD．otherwise

【C5】A．andB．howeverC．soD．therefore

【C9】A．ThereforeB．AndC．OtherwiseD．Meanwhile

【C15】A．ThereforeB．HoweverC．MoreoverD．And

【C5】A．ThereforeB．HoweverC．ThenD．Moreover

【C8】A．thereforeB．howeverC．likewiseD．nevertheless

【C6】A．ThereforeB．HoweverC．AlsoD．Otherwise