3 . 给我印象最深的是他们面对困难时从不泄气。
___________________ was that they never lost heart when faced with difficulties.

4 . 世界粮食计划署致力于实现的东西是缓解饥饿、保障食品安全和营养。
________the World Food Programme aims to achieve is to relieve________and support food security and________. (主语从句)

5 . 有机食品是否真正对人们更好依然不清楚。
________is really better for people remain unknown. (主语从句)

6 . It is likely that he will be late for school. (同义句转换）
＝He______ ______ ______ ______late for school.

7 . _________ __________ ________me most is that in Chimelong Ocean Kingdom in Zhuhai, we can walk under the world's largest Whale Shark Aquarium.
最吸引我的是在珠海长隆海洋王国，我们可以漫步于世界上最大的鲸鲨水族馆。

8 . _________ __________ _________that one billion people are suffering from hunger in the world.
据估计，目前世界上有十亿人在饥饿中挣扎。

10 . 据估计，这项治理水污染的工程至少要耗费三年的时间。
________ the project to control water pollution will take at least three years.