1.Nobody can answer the question.(改为同义句) The question___can't__ __be___ answered by anybody.
2 You can't lend the magazine to others.(改为被动语态)
The book__can't__ __be___ __lent___to others.
3 The lights should be turned off before you leave the classroom.(改为主动语态)
You_should__ _turn__off the lights before you leave the classroom.
4我们应该保护好环境
The environment around us_should__ _be__ _protected__ _well_.