Duty is an act or a course of action that people ____ you to take by social customs, law or religion.
I promise that she ___ get a nice present on her birthday.
He ___ without saying good-bye to them, for he always has good manners.
. He was not brave. He ____ jump down from the roof.
—Is your mother still a teacher? —______.
—Shall I go and buy two more bottles of beer? —No, I’ve already bought twenty. That ___ be enough for us two.