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Cement is ____ from varying amounts of limestone, clay, and gypsum.

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Small town newspapers ofter urge readers to ____ business with local merchants.

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The tips of high-speed dental drills are ____ of tungsten steel and often contain diamonds.

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Margaret Mead ____ fundamental contributions to both the theory and the field work of antropology.

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Many universities receive grants to ____ research for the federal government.

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Research in genetics in the early nineteenth century ____ much to improve agriculture.

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Futurologists study current trends to ____ predictions about the future.

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Filmmaker George Lucas has

____ many advances in the production of motion pictures, especially in the use of special effects.

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The distinction between wildflowers and weeds is one that is often difficult to ____.

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The helicopter can ____ jobs that no other aircraft can.

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