(1) Our inability to communicate with one another makes real contact between people of differing nationalities impossible.
(2) Inorganic chemists work to develop materials that are important in our lives.
(3) Mental patients have to be kept under strict supervision.
(4) They rejected his complaint that proper procedures had not been followed.
(5) Once he's back at the lab, he will sandpaper each core until it's shiny smooth, which enables him to take microscopic measurements of its rings. [東工大]