47. I’ve never seen the young man _____ next to the director. [(A)] sits [(B)] sat [(C)] sitting [(D)] to sit

51. Samuel Preston’s study shows that __________. [(A)] lifestyles and responsibilities of the elderly are not changing [(B)] most American couples over 40 have no living parents [(C)] middle-aged Americans have to take care of their children and parents at the same time [(D)] elderly people may need care for a long time because they live longer after an illness