『① Living conditions [was/were] terrible; disease was spreading quickly. ② An important quality of plastics [is/are] that they are easy to shape. ③ The typical equipment of a mathematician [is/are] a blackboard and chalk.』
『Many parents worry about the state of the world today and wonder how
they can feel (A)[safe/safely] when raising kids in this scary
world.(??) [2009??? 6? ?1 ???????? 21? ??]』
『The unforgettable musical, Rent, has been performed 5,140 times since
the show ①opened in 1996. (??) One of the numerous reasons fans kept
coming back ③are that the characters in the show are very realistic.
(??). [2009??? 6? ?1 ???????? 22? ??]』