15. ⑴ ____________________________________________

(我相信中国的饮食是世界上最健康的饮食。翻译：用上doubt)

⑵ _________________________________________(我怀疑他是否会遵守诺言)。

⑶ There is _____________________________________(毫无疑问，他不会来了。)

14. ⑴_______________________(难怪他不饿)，he has been eating sweets all day.

⑵ I _________________(感到奇怪) what he said.

⑶ We ____________(想知道) if we could see you again.

13. ⑴ The experiment ___________________(目的) test the new drug.

⑵ These books are primarily _______________(设计) for the use of beginners.

⑶ Once ______________(design), nothing can be changed.

12. ⑴_____________________________________________(大家仍保持沉默)。

⑵ _________________________________________(你是否正确，以后可见分晓)。

⑶ _________________________(剩余的前) should be given to his son.

11. Fortunately he ________________________________(在车祸之后还能活着)。

10. Besides, there are a lot of people _______　 ________(关心)in this world you.

②You must ________　 _______ _____ your luggage. 你一定要照看好你的行李。

③With such a pen friend, I think I can share with her our traveling experiences, ________　 _______ _____(照料/看)pets, or whatever we have in common.

9. ①______ _____ ___(作为对…的回报)the help of society , I want to serve my hometown heart and soul.

②On his __________, he 　reported his findings to the committee.

他一回来就向委员会报告调查结果。

③The professor paid a ___visit to his American colleague.教授回访了美国同事。

8. ① Isn’t it how ________(吃惊的) the human body heals itself after an injury?

②I was 　________(吃惊的) at his conduct. 我对他的行为感到惊讶。

7. ①The majority of students__________(认为) it necessary to go to college.

②Since money is so important to us , we __________(认为) those who possess a lot of it　 very important.

③The young couple _______/________ (考虑) having children.

6. Her face 　__________ up at the good news.她听到这好消息脸上露出了喜色。