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1. No spectacle in the universe is ___ than an exploding star.
2. The Allegheny and Monongahela rivers ___ in Pittsburgh, Pennsylvania, to form the Ohio River.
3. The horns of a rhinoceros continue ____ throughout its entire lifetime.
4. Mathematics helps meteorologists to predict the weather more accurately, to calculate the speed of storms, and _____
5. __________ position of the planet Earth in relation to the Sun is always changing a little bit.
6. Systems of phonetic writing are ____ at transcribing accurately any sequence of speech sounds.
7. In photosynthesis, ___ through which green plants manufacture food, energy from direct sunlight is trapped by a substance called chlorophyll.
8. _________ and hard, ivory may be carved with great delicacy into intricate patterns.
9. A solar eclipse occurs when the Moon is between the Sun and the Earth, ______ shadow of the Moon moves across the face of the Earth.
10. The spectacularly beautiful and sultry voice of Lena Horne made her ______
11. The existence of very long channels ____ into the deep- sea floor of the Atlantic and Pacific oceans has been well documented.
12. Lillian Wald’s ____ lies in the field of public health nursing.
13. Fine rubies ______ of flaws are extremely rare and command high prices.
14. In some parts of the world, not only ____ a form of entertainment, but it is also a means of communication.
15. Invented in the 1780’s, threshing machines enabled farmers to process grain ______ they could by hand.
16. Patients they suffer from common arthritis can be treated using heat, physical therapy, and aspirin.
17. Forests contain more than merely tree; they also include smaller plants, such as mosses, shrubs, and wild flowers.
18. The game of marbles, which originated in prehistoric times, is still played today in much lands.
19. The modern racing bicycle is carefully engineered for safety, lightness, and reliable.
20. On 1954 the United States Supreme Court ruled on the case of Brown v. Board of Education, declaring segregated education unconstitutional.
21. Because glass objects are fragile, least have survived from ancient civilizations.
22. An important effect that criticism can have on contemporary poets is the assurance that there is a growing interest their work.
23. Music festivals, which date back as far as the mid-seventeenth century, have increased significantly in popular within the past few decades.
24. Human skin is a complex, sensitive organ that serves many functions necessary for the maintain of life.
25. Space photography and advanced measurement technology, including a laser reflector placed on the Moon, have possible made extremely precise measurements of the surfaces of the Earth.
26. The scale of the demographic change that are now occurring and that are projected for the near future is unprecedented in human history.
27. The paintings of artist Abraham Rattner are noted for their brilliant color, rich texture, and symbolic.
28. Between the high and low tidemarks of marine coasts existing abundant and varied plant and animal life.
29. The total amount of water in the world’s ecological system has remained the same than throughout the ages.
30. Butterflies and moths comprise the Lepidoptera order of insects find
throughout most of the world.
31. The planet Neptune has two known satellites: one about the size with Earth’s Moon, the other much smaller.
32. Harry Truman’s victory over Thomas Dewey was one of the biggest surprise in the political history of the United States.
33. The narwhal resembles like other whales, but it has a long, spiral tusk growing from its head.
34. In exchange for requiring them to disclose the workings of their inventions, patents give inventors temporary, legally monopolies.
35. Lillian Gish is best known for her roles in such silently films as The Birth of a Nation and Broken Blossoms.
36. Oraibi, Arizona, built by the Hopi Indians during 1100’s, is probably the oldest continuous inhabited settlement in the United States.
37. It may take several hundred years to build inch of topsoil.
38. Known for power, speed, and maneuverability, the goshawk has short wings and a long tail, enabling them to dodge branches in pursuit of prey.
39. Lubrication is essential in machinery because if the moving part of a machine come into direct contact with each other, friction interferes with motion.
40. One basic principle of international air law recognize a country’s complete sovereignty over the airspace above its territory.