5. depends on　 　　　 6. Now that　　　　　 7. broke out　　 　　 8. spread　　

6. development　 7. disappointed　 8. harmful　 　　　 9. astronomers　 　　 10. published

V．1. cooling down 　　 2. present　　 　　　　　　　 3. get the hang of　 4. cheered up　　

6. unbelievable　 　 7. rude　　 8. humour　　　　　　 9. directors　　　　　　 10. bowing　　

　unit 4

IV．1. methods　 　　　 2 gradually　　 　 3 surface　　 　　　 4. planets　 　　 　　　 5. exists

1. energy　 　 2. balanced　　 3. characters　　 4. debt　 　　　　　　　 　　5. benefit　

6. in debt 　　　 7. by accident　　　　 8. get tired of　 9. get into trouble 10. To be honest

单词拼写

1. were about to　　 2. even if　　　　 3. earned her living　　　 　 4. to do with　　　 5. cut down

61. incredible 　　 62. items　　　 63. curiosity 　　 64. permitting　 65. forgiven　　　 　 66. account 　 67. combines　　　 68. religious　 69. jealous　 70. starve 71.humorous　 72. limited　 73. balanced　 74. newly-married　 75. frustrated

unit 2-3

30. It is pretty well understood______ control the flow of carbon dioxide in and out the atmosphere today.

A. that　　　 B. when　　　　 C. what　　　　 D. how

unit 1 – 3

29. There is a new problem involved in the popularity of private cars_____ road condition need_____.

A. that; to be improved　　　　 B. which; to be improved

C. where; improving　　　　　 D. when; improving

28. People have heard what the President had said; they are waiting to see_____ he will do.

A. how　　　 B. what　　　 C. when　　　 D. that