Preparacion TOEFL page 402

Often a team of engineers is ________.

________ in the world export diamonds.

A vacuum will neither conduct heat nor ________.

To relieve pain caused by severe burns, prevent infection, and treat for shock, ________.

All cereal grains ________ grow on the prairies and plains of the United States.

Besides rain, ________ is seldom pure.

Burrowing animals provide paths for water in soil, and so do the roots of plants ________.

________ a busy city, Pompeii was virtually destroyed by the eruption of Mount Vesuvius in 79 A.D.

In his autobiography, The Education of Henry Adams, Adams attempted to show that his generation ________.

The FDA was set up in 1940 ________ that maintain standards for the sale of food and drugs.

Green and magenta are complementary colors located opposite each other on the color wheel, ________.

Doublestars orbit ________.

John F. Kennedy was the youngest president of the United States and ________ to be assassinated.

Oscillatona, one of the few plants that can move about, ________ a wavy, gliding motion.

________ a teacher in New England, Webster wrote the Dictionary of the American Language.

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The bridge at Niagara Falls spans the longer unguarded border in the history of the world symbolizing the peace and goodwill that exist between Canada and the United States.

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Nitrogen must be combine with another element such as hydrogen or oxygen to be useful in agriculture or industry.

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In ancient times and throughout the Middel Ages, many people believed that the earth is motionless.

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Anyone reproducing copyrighted works without permission of the holders of the copyrights are breaking the law.

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Supersonic transport such the Concorde will probably be widely accepted as soon as problems of noise and atmospheric pollution are resolved

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It is generally believed that Thomas Jefferson was the one who had researched and wrote the Declarate of Independence during the months prior to its signing in July 1776.

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Because not food is as nutritius for a baby as its mother's milk, many women are returning to the practice of breast feeding.

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In the sixteenth century, Francois Vieta, a French mathematician, used the vowels a,e, i, o, y, to represent a unknown number.

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Increasing involvement in agriculture by large corporations has resulted in what is known as agribusiness--that is, agriculture with business techniques, including heavy capitalization, specialization of production, and to control all stages of the operation.

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Civil engineers had better planning to use steel supports in concrete structures built on unstable geophysical sites.

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Aristotle systematically set out the various forms of the syllogism that has remained an important reference for logic.

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If the oxygen supply in the atmosphere was not replenished by plants, it would soon be exhausted.

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With his father's guidance, Mozart begun playing the clavier at the age of three and composing at the age of five.

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The practical and legal implications of euthanasia, the practice of causing the death of a person suffering from an incurable disease, are so controversial as it is illegal in most countries.

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Programs such as Head Start were developed to prepare children from deprived situations to enter school without to experience unusual difficulties.

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Since lightning was probably significant in the formation of life, understanding it might help us to understanding life itself.

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Starfishes and sea urchins, members of the echinoderms or spiny skinned animals, are particularly interested because of their unusual structures.

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Almost poetry is more enjoyable when it is read aloud.

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It is essential that cancer is diagnosed and treated as early as possible in order to assure a succesful cure.

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Vasco da Gama, accompñanied by a large crew and a fleet of twenty ships, were trying to establish Portuguese domination in Africa and India during the sixteenth century.

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Gold, silver, and copper coins are often alloyed with harder metals to make them hard as enough to withstand wear.

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A vine climbs from one tree to another, continuing to grow and support itself even when the original supporting tree is not longer live.

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After Dr. Werner Arber discovered restriction enzymes, Drs. Daniel Nathan, Hamilton Smith, and him were awarded the Nobel prize for their research in that field.

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Although the Indians and the Eskimo had lived for centuries in Canada and the United States, when the European settlers came in the seventeenth century, the newcomers began a systematic effort to push them further into the wilderness and to take the land from their.

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Sometime ants keep smaller insects that give off honeydew, milking them regularly and even building barns to shelter them.