1. Helium is ………………. all gases to liquefy and is impossible to solidify at normal air pressure.

2. Every year Canadian………………….. about 75 percent of their exports to the United States.

3. An innovator, ballerina Augusta Maywood was ………………… a traveling company.

4. When water freezes in the cracks of rocks, ………………….. expands, causing the rocks to break apart.

5. With x-ray microscopes scientists can see through live insects …………….even through solid pieces of metal.

6. Dennis Chavez of New Mexico………………to the House of Representatives in 1930 and to the Senate in 1938.

7. …………….. are not leached out of soil, reclamation procedures are needed to restore the land’s productivity.

8……………… social crusade aroused Elizabeth Williams’ enthusiasm more than the expansion of educational facilities for immigrants to the United States.

9……………………..as 2500 B.C., the Egyptians used mirrors made of highly polished metal.

10. The quantum theory states ……………………… such as light, is given off and absorbed in tiny definite units called quanta or photons.

11. Quails typically have short rounded wings that enable …………..spring into full flight instantly when disturbed in their hiding places.

12. Geysers are found near rivers and lakes, where water drains through the soil…………….

13. Algebra generalizes certain basic laws……………………. the addition, subtraction, multiplication, and division of all numbers.

14. Even at low level, ………………

15. …………………. a lonely and rugged life, far from home and family.

16. The culinary expert Fannie Farmer taught dietetics, kitchen management, and to cook at her famous Boston school.

17. The elephant relies more on its sense of smell than for any other sense.

17. A few of the naturally elements exist in such small amounts that they are known mainly from laboratory-made samples.

19. Some insects hear ultrasonic sounds more than two octaves than higher humans can.

20. Because of its larger size, the United States House of Representatives is more impersonal, hierarchical, and specialization than the Senate.

21. To stay warm in cold weather, cold-blooded animals must expose itself to a source of warmth such as direct sunlight.

22. A severe illness where she was just nineteen months old deprived the well-known writer and lecturer Helen Keller of both her sight and her hearing.

23. Like all ecological systems, a forest is made up of a living environment and a nonliving environment, the latter composed of air, rocks, soiled, and water.

24. The purposeful of the elementary school is to introduce children to the skills, information, and attitudes necessary for a smooth adjustment to society.

25. Notorious as a host for wheat rust, the barberry bush has been banned from many area.

26. Christopher Plummer is a Canadian actor who has starred in stage, television and film productions on both sides the Atlantic Ocean.

27. A microphone enables musical tones to be amplified, thus making it possible the gentle renditions of soft songs in large halls.

28. The poetry of e.e. cummings illustrates the way in which some poets bend grammatical rules as they strive to expression their insights.

29. In the wild, tea plants become trees of approximately thirty feet in high.

30. Accounting is described as art of classifying, recording, and reporting significant financial events.

31. The development of the watch depended upon the invent of the mainspring.

32. The ordeal of the Cherokee Indians who were forcible moved from their homeland in the 1830’s is remembered as the “Trail of Tears.”

33. Physical fitness activities can lead to an alarming variety of injuries if participants push themselves greatly hard.

34. The structure but behavior of many protozoans are amazingly complex for single-celled animals.

35. Alaska’s rough climate and terrain divide the state into isolated regions, making highway maintenance difficulty.

36. For hundreds of years, sailors relied on echoes to warn them of another ships, icebergs or cliffs in foggy weather.

37. Although he is employed in the scientific and technical fields, the metric system is not generally utilized in the United States.

38. Prototypical oboes did a loud, harsh tone, but the modern oboe is appreciated for its smooth and beautiful tone.

39. Beneath the deep oceans that cover two-thirds of the Earth, intriguing secret of the planet are concealed.

40. The pioneer John Chapman received the “Johnny Appleseed” because he planted apple seedlings during him travels in what are now Ohio, Indiana, and Illinois.