1 . Strong winds blew off the roofs of many houses in the area. (改为被动语态)
The roofs of many houses in the area ___________   ___________ off ___________strong winds.

2 . 毋庸置疑，正是这个女孩的努力与勇气使她脱颖而出。
Undoubtedly, ___________   ___________ the girl’s effort and courage ___________ makes her stand out from the crowd.

3 . 人们相信垃圾分类政策将极大地帮助保护环境。
It ___________   ___________   ___________ the garbage-sorting policy will greatly help protect the environment.