1. …………………………a major role in future planetary exploration.

2. Unlike the owl, bats cannot see very well, but they do have_____.

3. Comparatively few clues in the United Slates have competing newspapers today, a major change from 1900 _____ more than two newspapers.

4. Witch hazel extract, ____ distilled from the bark and twigs of the witch hazel shrub, has been utilized in medicine.

5. ____ touching in O. Henry’s stories is the gallantry with which ordinary people struggle to maintain their dignity.

6. The face of the Moon is changed by collisions with meteoroids, ____ new craters to appear.

7. Social scientists believe that ____ from sounds such as grunts and barks made by early ancestors of human beings.

8. ____ substances include various forms of silica, pumice, and emery.

9._____ in the upper part of their long thin legs allow deer to run swiftly and jump far.

10. Geophysicists have collaborated with archaeologists and anthropologists to study the magnetic properties of pottery and fireplaces at sites ____– by early humans.

11. ____ technically proficient; it also explores psychological questions.

12.Although Canada’s Parliament can neither administer or enforce laws_____ initiate policy, it does have the power to make laws and vote on the allocation of funds.

13.Willa Cather considered her novel of life in nineteenth-century Nebraska, My Antonia,____

14.First designated in 1970, Earth Day has become an annual international event ______ concerns about environmental issues such as pollution.

15.In 1992 Albert Gore, Jr., the son of a former United States senator, became _____ Vice President of the United States.

16. Although Christopher Columbus failed in his original goal, the discoveries he did make were as Important than the route to Asia he expected to find.

17. Martha Graham, a leading figure in modern dance, made she debut in 1920 with the Denishawn School.

18. In the United States, the federal government is responsible to regulating the working conditions in factories.

19. Jupiter is a gaseous planet with. an atmosphere composed most of hydrogen and helium.

20. Throughout her career Georgia O’Keeffe paid meticulous attention to her craft; her brushes were always clean, her colors fresh and brightness.

21. Hydrogen the nine most abundant element in the Earth’s crust, is an odorless, colorless, and tasteless gas.

22. Salamanders are frequently to be find in moist, wooded areas.

23. Steam engines have been replaced in most cases by more economical and efficiency devices, such as the electric motor.

24. Traditionally, the Fourth of July is celebrated in the United States with political speeches, picnics, and most important of all, a displayed of fireworks at night.

25.The style of used in cartoon animation range from relatively realistic representations of everyday life to the most romantic and impossible fantasy.

26. Ordinary beaver dams vary in length from a few feet to a hundred feet or more than.

27. In the United State, presidential elections are held once every four year.

28.Except of the freehand toe, the feet of the gull are fully webbed.

29. Teaching machines are devices that can store instructionally information, present displays, receive responses from a learner, and act on those responses.

30. Challotte Perkins Gilman Is known primarily as an author of short stories, but she also wrote an influential book argued for equal economic opportunities for women.

31.In some areas of the United States, unfavorable climate or soil make farming an impossible task.

32. Naturalists have identified at least four hundred of species of mammals and six hundred types of birds in the state of California.

33. Instead of tooth, the blue whale has a row of bony plates in its mouth that functions as a food-collecting device.

34. Murres are black-and-white driving birds that mate every five or six years and lay only a single egg at time.

35. A bar code consists a pattern of lines and bars that a computer can translate into information.

36. Hummingbirds are the only birds that can fly to backwards.

37. Fluorine, a greenish-yellow gas that is slightly heavy than air is poisonous and corrosive and has a penetrating and disagreeable odor.

38. The Everglades, a large swamp area is an unique wilderness extending over much of southern Florida.

39. Each year millions of tons of fertile topsoil that could produce good crops washed away by rains.

40. Since the 1950’s, folk’ music has had a significant influence on many popular vocal and instrumental music.