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1.After being built, the Panama Canal was controlled by the U.S. government for
a) ten years
b) around fifty years
c) more than sixty years
2.Most of the 5,600 deaths recorded during the canal's construction were the result of
a) accidents
b) illness
c) overwork
3.A formal agreement between two or more countries, signed by each country's leader or representative, is called
a) a construction
b) a control
c) a treaty
