1. Certain types of computers work properly only in environments with controlled precisely temperatures.

2. In the United States, sleds for recreation were first produced commercial in the 1870’s or there abouts.

3. Lucretia Mott’s influence was too significant that she has been credited by some authorities as the originator of feminism in the United States.

4. Charcoal is employed widely as a deodorizer because it absorbs gases good.

5. Focus is an important learning strategy because it helps you learn new information more quicklier.

6. Health risks for overweight people are considerable more substantial than for people whose weight is normal.

7. Although they reflect a strong social conscience, Arthur Miller’s stage works are typical more concerned with individuals than with systems.

8. While highly prized for symbolizing good luck, the four-leaf clover is rarity found in nature.

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

10. Because their properties differ from those of their constituents, proper alloys can great increase the corrosion resistance of a metal.

11. When a magnet is free suspended it becomes a compass.

12. Made of sealskin stretched over a framework of whalebone or driftwood, an Eskimo kayak is completed enclosed except for the opening in which the paddler sits.

13. Proteins are made up of long, folded irregularly chains, the links of which are amino acids.

14. The mechanism of human thought and recall, a subject only partly understood by scientists, is extraordinary complicated.

15. The mountains, especially the Rocky Mountains, formerly constituted a seriously barrier to east-west trade in British Columbia.

16. The changes that occur in the life cycle of a butterfly or moth are probable the most striking examples of metamorphosis.

17. Because her work was popular with European royally, Harriet Goodhue Hosmer became financial successful as a sculptor in the mid-eighteen hundreds.

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

19. 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.

20. Zoos in New Orleans, San Diego, Detroit, and the Bronx have become biological parks where animals roams free and people watch from across a moat.

21. Physicists have known since the early nineteenth century that all matter is made up of tiny extremely particles called atoms.

22. Rain is slight acidic even in unpolluted air, because carbon dioxide in the atmosphere and other natural acid-forming gases dissolve in the water.

23…………………..substances include various forms of silica, pumice, and emery.

24. According to anthropologists, the earliest ancestors of humans that stood upright resembled chimpanzees ——, with sloping foreheads and protruding brows.