The U.S. lies in North America, with Canada to the north, Mexico to the south, the Atlantic to its and the Pacific to its .
A. northern, east, west
B. central, east, west
C. southern, west, east
D. western, west, east
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The continental United States has states.
A. 50
B. 49
C. 48
D. 35
The longest river in the U.S. is .
A. the Missouri River
B. the Mississippi River
C. the Ohio River
D. the Lake Itasca
Some of the world-famous universities like Harvard, Yale and MIT are located in .
A. the South
B. the West
C. New England
D. the Midwest
San Francisco, Los Angeles and San Diego all belong to .
A. Montana
B. Utah
C. Maine
D. California
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