They couldn't find the manager anywhere. It's necessary for everybody to clean up their neighborhood once a week. It is necessary to finish the work today

1. They couldn't find the manager anywhere.
The manager was..........................
2. It's necessary for everybody to clean up their neighborhood once a week.
Everybody ...................................................................
3. Since the invention of computer, people have saved a lot of time.
Since the computer was ..............................................
4 It is necessary to finish the work today.
You need...............................................................................
5. Nobody can deny that she has a beautiful voice.
It........................................