左の(1)～(4)につづく英語として，語法，文脈から判断して最も適当なものを右の(a)～(d)より1つ選び，その記号を書きなさい。なお，(a)～(d)はそれぞれ1回しか使えません。

• (1) These people often fall through
• (2) The workers had been primed to
• (3) None of the parables lends itself to
• (4) The doctor kept his nose to

• (a) the grindstone day after day.
• (b) say nothing about the case.
• (c) being made into a play.
• (d) the cracks in society.