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1 ________ are generated by air flowing out of the lungs.
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2 Virtually ______ species have biological clocks that regulate their metabolism over a 24-hour period.
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3 Viruses are ______ than cells and can be detected only with powerful electron microscopes.
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4 In computing, a support environment is ______ used to help people design and write other programs.
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5 For tens of thousands of years, fish ______ an important part of people’s diets.
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6 The metronome, ______ that serves to indicate the tempo of a piece of music, was invented in the seventeenth century.
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7 On April 17, 1610, Henry Hudson set out in the 5.5-ton ship Discovery on ______ fourth voyage of exploration.
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8 Sulfur, ______ most elements lighter than iron, is believed to have been created by the nuclear fusion of lighter elements in the interior of stars.
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9 The fluoroscope makes ______ for medical doctors to view a silhouette of the bones and internal organs of a patient’s body.
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10 Elementary schools in the United States provide formal education — ______ arithmetic, science, social science, and communication skills that include reading, writing, spelling, and speaking.
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11 Democratic governments constantly face the problem of balancing ______ the individual with the needs of society.
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12 Not until the First World War ______ to improve the road system in the United States.
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13 An unconsolidated aggregate of silt particles is also termed silt, -- ______ a consolidated aggregate is called siltstone.
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14 In jazz music, a riff is a simple melodic figure, ______ and repeated several times.
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15 ______ highly elliptical orbit of Mars carries it as far as 155 million miles from the Sun and as close as 128 million miles.
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16 A liquid is similar at a gas in that a liquid can fit the shape of any container into which it is put.
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17 Sentence: Dark green leafy vegetables are a source of folic acid, an importance part of the vitamin B complex.
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18 Sentence: T. S. Eliot, who a poet, playwright, literary critic, and editor, was a leader of the Modernist movement in poetry.
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19 Sentence: Music involves the interaction of three elements: rhythm, melodic, and harmony.
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20 Sentence: No one knows why galaxies become a particular shape, but it may depend on quickly how stars form inside.
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21 Sentence: The Democratic Party, the most oldest existing political party in the United States, has played a vital role in the nation's history.
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22 Sentence: There is about 80 species of pine trees and all except one grow in the Northern Hemisphere.
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23 Sentence: Although Willa Cather was born in Virginia, she spent most of her life on the Nebraska prairies, the area which her fiction is associated.
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24 Sentence: In 1791 the state of Maryland gave part of its land to the United States government, and these area became known as the District of Columbia.
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25 Sentence: Ethnology, usually considered a branch of cultural anthropology, is often defined as the scientifically study of the origin and functioning of humans and their cultures.
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26 Sentence: While government-sponsored social assistance programs vary from country to country, all provide some cash payment to defray income loss due to sickness, old age, or unemployed.
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