—The problem is very difficult. I'm afraid you can't work it out now. — I fail this time, I will try it again.
Gun control is a subject_____ Americans have argued for a long time.
Ladies and gentlemen, please remain_____ until the plane has come to a complete stop.
As is often said, a friend is to man_____ water is to fish.
To his disappointment, the opinion he had held____ out wrong.
—My son has got a straight A in all his final exams.— What a ____ boy! Congratulations!