In the poor parts of America's big cities there is a lot of crime, _____ .
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.
The teacher said that the sun ________ in the east and ________ in the west.