It’s eleven p.m.. Mary is still working _____ the light. [ ]

I got to the party late. By the time I arrived, some people ______ home already.

The old woman was ___ tired ___ go any farther. [ ]

If there are _______ people driving, there will be _______ air pollution.—Yes, the air will be fresher.

_____of the warm water _____already been used up.