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1. ______ is helping to break new ground in drug research.
2. An elephant ______ vigorously when it is overheated.
3. Broadway musical comedy has been called ______ of the United States to modern theater.
4. ______ in 1968 as a nonprofit agency to finance the growth of noncommercial radio and television in the United States.
5. Cold temperatures; short growing seasons, and heavy snows prevent ______ at high elevations.
6. Usually, the more skilled an athlete ______ the more effortless the athlete’s movements appear to be.
7. Trilobites, a group of spineless animals, flourished in the oceans for several hundred million years ______ some 200 million years ago.
8. Recent engineering developments have made ______ to recycle plastic soda bottles into polyester fabric.
9. ______, bottle-nosed dolphins become talented performers at many aquariums.
10. The art of the 1970’s was characterized by diversity and by the independence of artists ______ main affinities were more often sociopolitical than stylistic.
11. Flower oils are ______ of the ingredients used in making perfume.
12. A quilt that looks ordinary ______ may become a work of abstract art when it is hung on a white wall.
13. ______, the hummingbird gets its name from the sound that its wings make during flight.
14. Except for the Sun, all stars are too far from the Earth for their distances ______ in miles or kilometers.
15. Many technological innovations, such as the telephone, ______ the result of sudden bursts of inspiration in fact were preceded by many inconclusive efforts.
16. Corporations, companies owned by much stockholders rather than by a single proprietor, began to play an important economic role in the late nineteenth century.
17. Diamonds have the unique ability to allow the passage of neither infrared and visible light
18. Gilbert Newton Lewis, a chemist, helped to develop the modern electron theory of valence, a theory what explains the forces holding atoms together in molecules.
19. The first women governor in United States history was Nellie Tayloe Ross, who was elected governor of Wyoming in 1925.
20. Because of a high birthrate and considerable immigration, the United States population in the late nineteenth century increased tremendously into 31 million in 1860 to 76 million in 1900
21. In laboratory experiments, an investigator often begins by work out different conditions for two groups of subjects.
22. In Florida, when the temperature drops below freezing, citrus growers keep young tree warm by constantly showering them with water.
23. The pitch of a musical instrument is defined as the relative highness or low of the sound it produces.
24. The delicious of chocolate depends not only on the quality of the cacao but also on a complex process of grinding, heating, and blending
25. Scientists have found that occasional exposure to bright light can be help a person get used to working the night shift.
26. Rocks have forming, wearing away and re-forming ever since the Earth took shape.
27. For most of their history, especially since the 1860’s, New York City has been undergoing major ethnic population changes.
28. The dramatic first-floor gallery of the New Britain Museum of American Art is devoted to Thomas Benton’s series of five oversized mural.
29. Although color is a minor factor in soil composition, it is excellent characteristic by which to distinguish different soil layers.
30. Eagles are predatory birds that have large, heavy, hooked bills and strong, sharp claws called as “talons.”
31. Cotton is one of the most popular fiber used to make clothes
32. Turreted mansions decorated with elaborate wooden ornamentation became a mark of wealthy and elegance in the United States in the late nineteenth century
33. Most of our ideas of what ancient people looked and dressed come from the works of Renaissance artists
34. Plants require much less moist in cold weather than in warm weather.
35. All nations may have to make fundamental changes in their economic, political, and the technological institutions if they are to preserve the environment.
36. Massachusetts was first explored in the late sixteenth and early seventeenth centuries, and the first permanent settlement at Plymouth in 1620
37. Sarah Vaughan had a voice like a perfect instrument, and it was an instrument that she knew how to use it with the utmost skill
38. During early nineteenth century, the building of canals and railroads strengthened the state of Indiana’s links with the eastern United States.
39. Maryland, even though a southern state, remained loyalty to the Union during the Civil War.
40. A monsoon is an enormous cycle of air set in motion by differences temperature over land and sea.