1. C??2. C??3. A??4. A??5. D??6. A??7. B??8. B??9. D??10. C
11. A?12. B?13. D?14. C?15. D?16. B?17. C?18. B?19. D?20. A
21. D?22. B?23. C?24. B?25. B?26. C?27. C?28. A?29. A?30. A
31. D?32. D?33. C?34. A?35. A?36. D?37. B?38. C?39. D?40. B
41. C?42. A?43. B?44. A?45. A?46. D?47. B?48. D?49. B?50. A
51. C?52. A?53. B?54. C?55. C?56. C?57. C?58. D?59. B?60. A
61. D?62. D?63. D?64. D?65. A?66. D?67. B?68. A?69. C?70. B
71. (instead) ? (instead) of?72. like ? as
73. has ? have?74. the (hand) ? /(hand)
75. it ? them?76. (leads) ? (leads) to 或 leads ? causes
77. down ? up?78. Nevertheless ? Therefore/So
79. works ? work/job/jobs?80. international ? national