It ________ as a shock to realize that I was not alone in the room.
A
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________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
Hethoroughlyunderstoodthesociety__________.
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
Humanbehaviorismostlyaproductoflearning________thebehaviorofanimalsdependsmainlyoninstinct.