----How often do you _________ the dictionary when you are doing reading? ----Not very often. Only when I find it is necessary.
17.I’m ____a diet, since I put ____ weight easily.
16.He is heavily ____ now, so he can’t pay for a new house.
15.---Tom is never late for work. Why is he absent today? ---Something ________ to him.
14.It is not who is right but what is right _______ is important.
13.The doctors have told him to ____ smoking and drinking.