【C2】A．butB．orC．andD．while

【C3】A．ButB．BecauseC．AndD．So

【C10】A．thereforeB．orC．andD．as

【C3】A．ButB．SoC．AndD．Or

【C8】A．butB．while "C．andD．whereas

【C2】A．howeverB．althoughC．andD．while

【C6】A．butB．orC．howeverD．unless