1. Simple photographic lenses cannot ……………………..sharp, undistorted images over a wide field.

2. Of all the factors affecting agricultural yields, weather is the one ……………….the most.

3. Beverly Sills, ………………… assumed directorship of the New York City Opera in 1979.

4. ………………… of tissues is known as histology.

5. With the exception of mercury, ………………. at standard temperature and pressure.

6. Potential dehydration is ……………that a land animal faces.

7. By tracking the eye of a hurricane, forecasters can determine the speed at which ……………..

8. The grapes of Wrath, a novel about the Depression years of the 1930’s, is one of John Steinbeck’s ……………….. books.

9. Technology will play a role in ………………… future life-styles.

10．The computer has dramatically affected ………………… photographic lenses are constructed.

11. The early railroads were ……………… the existing arteries of transportation: roads, turnpikes, canals, and other waterways.

12. ……………… as a masterpiece, a work of art must transcend the ideals of the period in which it was created.

13. Jackie Robinson,…………………. to play baseball in the major leagues, joined the Brooklyn Dodgers in 1947.

14. During the flood of 1927, the Red Cross, ……………….out of emergency headquarters in Mississippi, set up temporary shelters for the homeless.

15. In bacteria and in other organisms, ……………….is the nucleic acid DNA that provides the genetic information.

16. Twenty to thirty year after a mature forest is cleared away, a nearly impenetrable thicket of trees and shrubs develops.

17. The first national park in world, Yellowstone National Park, was established in 1872.

18. Because it does not have a blood supply, the cornea takes their oxygen directly from the air.

19. Magnificent mountains and coastal scenery is British Columbia’s chief tourist attractions.

20. Scientists at universities are often more involved in theoretical research than in practically research.

21. John Rosamond Johnson he composed numerous songs, including Life Every Voice and Sing, for which his brother, James Weldon Johnson, wrote the words.

22. Nylon, a synthetic done from a combination of water, air, and a by-product of coal, was first introduced in 1983.

23．Ornithology, the study of birds, is one of the major scientific fields in which amateurs play a role in accumulating, researching, and publish data.

24. Animation is a technique for creativity the illusion of life in inanimate things.

25. The nonviolent protest advocated by Dr. Martin Luther King proving highly effective in an age of expanding television news coverage.

26. On December 7,1787, Delaware became a first state to ratify the Constitution.

27. Nutritionists believe what diet affects how one feels physically and emotionally.

28. Mealii Kalama, creator of over 400 Hawaiian quilts was granted a National Heritage Fellowship in 1985 for herself contributions to folk and art.

29. A jetty serves to define and deepen a channel, improve navigate, or protect a harbor.

30. Minoru Yamasaki is an American architect which works departed from the austerity frequently associated with architecture in the United States after the Second World War.

31. Chemical research provides information that is useful when the textile industry in the creation of synthetic fabrics.

32. Jane Addams, social worker, author, and spokeswoman for the peace and women’s suffrage movements, she received the Nobel Peace Prize in 1931 for her humanitarian achievements.

33. Bromyrite crystals have a diamond-like luster and are usually colorless, but they dark to brown when exposed to light.

34. Stars in our universe vary in temperature, color, bright, size and mass.

35. Ice is less denser than liquid from which it is formed.

36. The 1983 Nobel Prize in Medicine was awarded to Barbara McClintock for her experiments with maize and her discoveries regardless the nature of DNA.

38. Most of the damage property attributed to the San Francisco earthquake of 1906 resulted from the fire that followed.

37. In 1866 to 1883, the bison population in North American was reduced from an estimated 13 million to a few hundred.

39. James Baldwin’s plays and short stories, which are to some degree autobiographical, established them as a leading figure in the United States civil rights movement.

40. Thunder can be listened from a maximum distance of about ten miles except Under unusual atmospheric conditions.