46. The children are required not to leave the building unless _____ to do so. [(A)] being told [(C)] be told [(B)] they will be told [(D)] told

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

46. The children are required not to leave the building unless _____ to do so. [
(A)] being told [
(C)] be told [
(B)] they will be told [
(D)] told

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