The key to exercise solutions in chapter Unit 43 - Passive 2 for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
Instead of using 'somebody', 'they' etc., write a passive sentence.
Answer
The room has been cleaned.
A new road is being built around the city.
Two new hotels have been built near the airport.
some new houses were being built.
The date of the meeting has been changed.
I didn't know that our conversation was being recorded.