_______ you think graffiti (涂鸦) is mindless vandalism(破坏行为) against property or a living art form, its popularity suggests that it is here to stay.
Action must be taken to prevent that factory from ______ heavy smoke into the air.
— Can you see what is written on that board? — Yes. It _______ “CAUTION: WET FLOOR”.
Could you tell us ______ happens when one student in class expresses a personal opinion _______ maybe upsets other students?
Let’s take _____ ten-minute break and have _______ drink of water.
He _______ us that everything would go according to plan, but it turned out a failure.