【C4】A．thatB．whileC．thenD．when

A．HoweverB．WhileC．ThenD．Therefore

【C4】A．thatB．anyC．thisD．an

【C4】A．howeverB．whileC．ifD．because

I was about to fall asleep______there was a knock at the door.A．asB．whileC．thenD．when

【C14】A．AndB．WhileC．ThenD．Or

【C4】A．thatB．whichC．howD．what