If someone has to an action or policy, they are responsible for it, and may be required to explain it to other people or be punished if it fails.
Many people, some of ______ are not overweight at all, are always going on diets or taking weight-loss pills, _____ are often dangerous.
In my opinion, work provides us much ________ just salary and income; it also helps us realize our dreams and makes us feel confident.
The teacher set such difficult problems ______ nobody could work out _____ none of us passed the test.
The doctor insisted that the patient_______seriously ill and that an operation_______in no time.
It _____ every day so far this month. I can’t tell you if it _____ tomorrow.