Can't be idle-the composition is about 600 words.

Uncle Wang is a temporary worker in the reception room of our school. He is nearly seventy years old, tall and thin, giving the impression that he is smart and capable. Although he is only an supernumerary, he regards the school as his home and is always busy. Which class's light is broken, Uncle Wang appeared at the scene immediately. The key of which class is broken, Uncle Wang hurried over. There is always Uncle Wang in the flower bed of the school ... The mop of our class was broken a few days ago, and Uncle Wang asked me to send the broken mop to the reception room. As soon as I entered the reception room, I saw Uncle Wang with his head down, his left foot standing on the mop handle, his left hand holding a fixed frame made of wire and nails, and his right hand holding a hammer to nail the mop. There are some nailed mops beside it. I asked, "Uncle Wang, why did you nail so many mops?" Uncle Wang smiled and said, "The mop nail is not good, and it will fall off as soon as it is used. Besides, the teachers are very busy, and your children are still young and can't nail well. I am an idle person, so I should do more to lighten the burden for everyone. I am also happy in my heart. " I gave a thumbs up. "Grandpa, you are great!" Look, this is our good uncle, a man who will never be idle.