It's necessary for everybody to clean up their neighborhood once a week.
Everybody ______________________________________________________________________

Since the invention of computer, people have saved a lot of time.
Since the computer was ____________________________________________________________

Gary is the best guitarist in her class.
No one else ______________________________________________________________________

The furniture was too old to keep.
It was __________________________________________________________________________

Don't leave the lights on all night, you will waste electricity.
If ______________________________________________________________________________

English is easy to learn.
It ______________________________________________________________________________

She had to do the washing up but she didn't.
She forgot _______________________________________________________________________

It may rain hard this afternoon, so take the rain coat with you.
In case _________________________________________________________________________

Their trip lasted three day.
They had ________________________________________________________________________

When did you first know him?
How ___________________________________________________________________________