_________ is known to all,good friends _________ happiness and value to life.
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.
10.--- Hello, John here, can I speak to Mary , please?---_____________.