I had been puzzled over the problem for over an hour without any result, ____ all at once the solution flashed across my mind.
The murderer was brought in ,with his hands ______behind his back.
He was disappointed to find his suggestion_______.
The salesman scolded the girl caught ______and let her off.
It was so cold that they kept the fire ________all night.
Believe it or not, he was seen ______upstairs just now.