He knew that cholera would never be controlled _____ its cause was found.
The international police has come into existence and they were ____ the key to global security.
The boy was in the water and his canoe was_______ away.
The task is hard, ____, the workers managed to finish it in time.
Mrs. Clarke raised the kettle and _______the water over the hand.
Our cousin who is attending college in New York phones us every Sunday at six, _________ as clockwork.