Knowledge has changed my character. When I was young, I was very impetuous. I hardly talked to others and was careless in everything I did. But from school, I learned to read, and found the charm of China language and the fun of communication from words, phrases, sentences, paragraphs and chapters. English once again brought me to the ocean of ABC, let me embrace the world, eager to have a pair of wings to fly to every corner, showing the history of China's civilization in 2000. Math taught me to be careful. Whenever I am upset, the symbols of addition, subtraction, multiplication and division can make my mood calm gradually. As a result, my impetuous personality has changed a lot, and gradually became the present me-cheerful and lively.