Follow your teacher’s advice, __________ you will catch up with your classmates.
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.
12.This statue was put up _________ Dr. Sun Yat-sen.
11.There is no light on--- they _______ be at home.