—Is David a man with good manners ?—I don’t think so . As a matter of fact , he is but polite .
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
Although punctual himself, the professor was quite used ________ late for his lecture.
.When people move to another country, they often try ________ the customs of their native land.
The experiment is of particular importance. —I see. We will carry on with it ________ we can get enough money.
.I think that this meal was well worth ________ was charged for it.