Writing
The world is filled with many sounds . Everyday we are surrounded by all kinds , such as music and noise .
Some sounds are useful . Among these useful sound , music is very important . Music brings a lot of pleasure to us and makes our lives colorful . Of course , there are also other useful sounds . Such as whistles of police car which inform us to give way to emergency .
But some sounds as harmful . For example , the noise made by the loudspeaker of a car can disturb our peaceful lives . Therefore , in some cities , cars are forbidden to blow whistles . In the end , we hope the world can be filled with more useful sounds and less harmful sounds .

Reading Comprehension
21. D 22. A 23. B 24. D 25. D 26. B 27. A 28. B 29. C 30. B 31. C 32. A 33. D 34. B 35. D 36. C 37. D 38. A 39. A 40. C

Vocabulary and Structure
41. C 42. A 43. A 44. B 45. B
46. C 47.D 48. D 49. A 50. C
51. C 52. D 53. B 54. B 55. B
56. D 57. A 58. B 59. B 60. C
61. C 62. A 63. B 64. D 65. C
66. B 67. A 68. B 69. C 70. A