13. We spent a pleasant hour or two talking with our friends.(改为同义句) 

It        us a pleasant hour or two              with our friends.

12. Please tell us when we should leave.(改为简单句)

 Please tell us              leave.

11. They have to know how they can make money.(改为简单句) 

They have to know              make money.

(   ) 6. ―        do you feel about pollution?

―Angry. We must do something to protect our environment.

   A. What   B. How   C. Why   D. Where

(   ) 7. I'm sorry to keep you        so long.

   A. waiting   B. to wait   C. wait   D. waited

(   ) 8. Our music teacher        me dance to the music.

   A. asked   B. made   C. told   D. wanted

(   ) 9. It is        sad that it made us cry.

   A. so   B. too   C. very   D. such

(   ) 10. I'd rather        TV at home than        to the cinema.

   A. to watch;go   B. watching; to go

   C. watch; go   D. to watch; to go

1. 浅蓝色         

2. 花更多的时间吃饭         

3. 从科学研究中学到很多东西         

4. 濒临灭绝的动物         

5. 为很多人服务         

 15. makes; people; spring; happy

 14. red; most;makes; of; people; energetic; feel

13. why; you; buy; don't; her; as; a camera;a; birthday; present

12. enough;she; her; old; to; make; own; decision; is 

11. it's; to; feel;make;comfortable;your grandma;important