He had to pause from time to time to wipe the sweat from his forehead, because the air—conditioning system ______________.
You can’t predict everything. Often things don’t ______as you expect.
I woke up with ____bad headache, yet by ______evening the pain had gone.
—The trip shouldn’t take more than an hour. — ______It is at least two hours.
Can you make sure ______ the gold ring?
It is careless _______ such a mistake.