（  ）15. Many parts of the world have removed the salt of sea water to get some fresh water.

38. In the sentence “Some of the challenges are practical”, “practical” means ____.

42. What is the cheerleaders’ main goal?

30. The plans of collecting housing property tax have been under ____ for two years.

22. No matter how frequently ____, the works of Beethoven always attract a large number of people.

35. The theory of ____ was developed by Darwin and is now understood by nearly everybody in the world.

21. We agreed to accept ____ they thought was the best tourist guide.

36. According to David Paik, being your own boss is ____.

32. An emergency ____ is very important in case of fire.

49.Residence listing: provide in the   49  section of directory.

45.Which of the following is NOT the guideline for competitive cheerleading?

64. 人们过去并未充分了解心灵的宁静对健康极为重要。