1. A log grabber has a long arm __________, which stretches out to pick up logs.

2. A home computer ……………….an opportunity for convenient and efficient work at home.

3. Eli Whitney’s milling machine remained unchanged for a century and a half because ………………was so efficient.

4. Some of the rainwater from clouds evaporates before ……………….

5. Once an offending allergen has been identified ……………..tests, it is possible for the doctor to give specific desensitizing injections.

6. Sometimes ………………..wears people out and is worse than the lack of sleep itself.

7. Although dissimilar in almost every other respect, birds and insects have both evolved efficient ………………….capabilities.

8. The wheel, ………………..has remained important for 4,000 years, is one of mankind’s first inventions.

9………………………. children master the basics, advanced development becomes easier.

10. …………………….. there is a close correlation between stress and illness.

11. ……………………  is often used in soups and sauces.

12. Perspiration increases …………………….. vigorous exercise or hot weather.

13. Goddard developed the first rocket to fly faster …………………..

14. if the unemployment rate ………………………sharply, the drop may still be temporary.

15. Studies indicate ……………………. collecting art today than ever before.

16. The surface of the tongue covered with tiny taste buds.

17. Cosmic distance is measured on light-years.

18. A million of tourists from all over the world visit New York every year.

19. Whereas Earth has one moon, the planet call Mars has two small ones.

20. An ardent feminist, Margaret Fuller, through her literature, asked that women be given a fairly chance.

21. No longer is scientific discovery a matter of one person alone working.

22. The scientific method consists of forming hypotheses, collect data, and testing results.

23. All data in computer are changed into electronic pulses by an input unit.

24. The basic law of addition, subtraction, multiplication and division are taught to all elementary school students.

25. A largely percentage of Canadian export business is with the United States.

26. The famous Jim Thorpe won both the pentathlon or decathlon in the 1912 Olympic Games.

27. Acute pharyngitis pain is most often caused by a viral infection, for who antibiotics are ineffective.

28. Knowledges about cultures provides insights into the learned behaviors of groups.

29. A fiber-optic cable across the Pacific went into service in April 1989, link the United States and Japan.

30. Dislike the gorilla, the male adult chimpanzee weighs under 200 pounds.

31. Before lumberjacks had mechanical equipments, they used horses and ropes to drag logs.

32. George Gershwin not only composed popular songs for musicals, also wrote more serious concerts.

33. Among the world’s 44 richest countries, there has been not war since 1945.

34. Caricature, a type of comic exaggeration, is common used in political cartoons.

35. One and more sentences related to the same topic form a paragraph.

36. Mirrors done of shiny metal were used by the Egyptians in ancient times.

37. Mark Twain’s Adventures of Huckleberry Finn are one of America’s national treasures.

38. In his early days as a direct, Charlie Chaplin produced 62 short, silent comedy films in four years.

39. Some studies show that young babies prefer the smell of milk to those of other liquids.

40. Plants absorb water and nutrients and anchoring themselves in the soil with their roots.