Person's life can be done?What is the significance of people

Person's life can be done?What is the significance of people what's the significance of reading novels? what's the significance of the "catcher in the rye"? What can be done to make the person I love happiness? what's the significance of Chairman Hu surfed internet? What's done can not be undone. What is done can not be ______________ what is done can't be undone He is one of those people who promise more than can be done. Can you tell me what is the meaning of life Eaucation can ( ）（ ）（ ）（ ）to the quality of a person's life what's the significance of Discovery of Newland and it's inf