【C17】A．WhileB．AlthoughC．SinceD．So

A． AlthoughB． WhetherC． SinceD． When

【C10】A．DespiteB．AlthoughC．IfD．So

A．becauseB．althoughC．unlessD．so

【C17】A．thisB．thatC．itD．so

【C18】A．WhileB．OnceC．SinceD．Though

【C10】A．UnlessB．AlthoughC．SinceD．If