He thoroughly understood the society __________.
C
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________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
Wemust______thattheexperimentiscontrolledasrigidlyaspossible.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Constructionoftherailwayshelpedtodevelopthenational_______ofTanzaniaandZambia.