bad news

Recently, I heard some bad news that happened around me. The first one is my math teacher of senior high school. He died because liver cancer. It made me feel so surprised because he was a healthy person. The second one is a friend who I met her for only two months. I even had no many talks with her, but she left. I know that everyone is going to be dying, but why they die without any alert? It is unexpected; I do not how to react when I heard the news. Because of that news, I realized that life is changeable. We cannot say when we want to live or die. All I have to do now is treasure my life.