_________(58)
A.when
B.for
C.but
D.that
___________A] when [B] since [C] for [D] whereas
___________[A] when [B] once [C] while [D] whereas
_________(53)A.when B.thatC.where D.which
_________(59)A.when B.whereC.which D.what
_________(59)A.when B.whatC.why D.how
_________(53)A.when B.afterC.before D. until