【C10】A．UnlessB．AlthoughC．SinceD．If

A．unlessB．beforeC．thusD．until

【C10】A．DespiteB．AlthoughC．IfD．So

【C10】A．BecauseB．ThoughC．WhetherD．If

A．SinceB．AlthoughC．HoweverD．Only if

【C17】A．WhileB．AlthoughC．SinceD．So

【C16】A．becauseB．even ifC．sinceD．if