There are some health problems that , when _______ in time , can become bigger ones later on.
_____ I sympathize, I can’t really do very much to help them out of the difficulties.
For some time now, world leaders _____ out the necessity for agreement on arms reduction.
Have you ever been in a situation _____ you know the other person is right yet you cannot agree with him?
You _____ Jim anything about it. It was none of his business.
Professor Johnson is said _____ some significant advance in his research in the past year.