—I'm sorry I stepped outside for a smoke. I was very tired.
—There is no ______ for this while you are on duty.

A．They worry about school.
B．They dislike living with their parents.
C．They have to be locked in to avoid troubles.
D．They quarrel a lot with other family members.

A．The Indians had invented the hammock long before they came to South America.
B．The Indians had invented the hammock long before the Europeans came to South America.
C．The Europeans invented the hammock after they made acquaintance with the Indians.
D．The Europeans had invented the hammock before they went to South Americ