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In total darkness, doves ________.

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The experiment with the dove indicates that ________.

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By“his outdoor cousins”the author means ________.

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During daylight hours, birds _________.

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The reasons why birds don't get lost on their 10ng flights _____

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The real solution to the gas shortage problem is ________.

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With a car people can go ________ easily.

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“A nation on wheels”means that ________.

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Henry Ford was the first to ________ cars in large numbers.

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Most Americans feel they are poor when they ________.

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