1. I know from my own _______ (经验) how difficult the work can be.
2. The children all rose up when the _______ (校长)came in.
3. I _______ (敬重)him for his diligence.
4. The _______ (平均的)age of the boys in this class is fifteen.
5. Let’s join hands and _______ (奋斗)together.
