We will have no water to drink _________ we don’t protect the earth.A. until B. if C. unless
The rest _______ the money _______ to be sent to him.
----- I don’t think teenagers should drive cars.-----_________. They aren’t serious enough.
My teacher has a lot of experience _________ English at school.
Some of the apples are bad, but I believe the rest sweet.
It’s dark. I would rather _______ in bed than _______ a walk outside.