______ is known to us all , the old scientist,______ life was hard in the past, still works hard in his eighties.
____ she finds out that you’ve lost her book?
In our school students are according to how much they know and how old they are.
There was plenty of time. We _____.
It suddenly ________ to me that we could use a computer to do the job.
I am________your suggestion________we should spend more time on this project.