Storms most commonly occur_______a warm air mass and a cold air mass touch each other.
— Would you mind if I turned the TV down?— ________.
If you don’t know what it means, ________ the dictionary.
He is not native, if he were, we _______ this discussion over his identity.
The snow was now two feet deep, making it difficult, if not impossible, _______ the car out.
The story carries a strong message, _______ that will hopefully touch all who read it.