---Why do you pay a visit to your parents ________?---_______ they live in a remote village far from here.
It is required by law that the children above six years old in our country ________ to school to receive education.
The audience ______ before TV sets are listening to Yi Zhongtian’s stories with their eyes _____ upon him.
Our son doesn’t know what to ______ at the university;he can’t make up his mind about his future.
I’m living in the apartment nearby. Come and see me whenever________.
—I hear that you will be on travel again. —Yeah. My boss __________ for me to discuss business details with someone from another company.