Strong sandstorms are often _____ you cannot see the sun.
We have already said a good deal about the various problems _______ the war.
Theory is ______ in that it can provide a direction for practice.
The boy then led her into the warm hall and left her ______ by the fire.
Between the two mountains _________ the factory where my father used to work.
They were lost at sea, _______ the mercy of wind and weather.