In the United Kingdom, the party which wins the ________ number of seats in the House of Commons becomes the official Opposition.
B
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In 1900, the United States ranked first in the world in the production of ________.
The Mississippi, which is sometimes called ________, has played a vital role in the history of the United States.
The average life expectancy of the Red Indians is ________.
The longest river in Canada is ________.
The theme of Thanksgiving has always been ________.