【推荐1】The teacher highly recommended that we should make full preparations for the exams.(同义转换)
It was highly recommended that full preparations_________ _________ _________for to exams.

【推荐2】We must water the flowers every day. (用被动语态改写)
The flowers must ________ ________ every day.

【推荐1】北京正为2022年冬奥会做准备工作。
Preparations ________ the 2022 Winter Olympic Games in Beijing.

【推荐2】In many of the places where the butterfly can be found, the natural environment ________ by people.
在这种蝴蝶所见之处，自然环境正为人类所破坏。

【推荐3】I need one more stamp before my collection is ________________.
我还得需要一张邮票才能完成我的集邮册。