1. He died of an illness _____ by smoking too much.

A. caused         B. causing          C. to be caused         D. being caused
2. I think the director’s attitude___ this program will decide what we should do next.
  A. for                    B. of                   C. at                          D. towards
3. In order to keep their trade___, they would have to buy less goods in the United States.

A. balanced        B. balancing       C. to balance             D. being balanced