____ the crisis of economy getting more and more serious, the government is searching for ways to improve people’s life.
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.
—You must obey every word of mine!— _____ I don’t?