—Is David a man with good manners ?—I don’t think so . As a matter of fact , he is but polite .
At the conference, they came up with three different _____ to solving the serious problem.
The music brought the days back to me _____ I was out of work wandering hopelessly on the streets.
Jack is the right person you can rely on to ____ the research when you are on vacation for the next two weeks.
He failed the final examination and only then ____ how much time he had wasted.
Recently, however, scientists have been finding that long-term use of these fertilizers can cause damage to the land, thus _____it less fertile.