It is necessary for us to keep a promiseIn my idea, it is necessary for us to keep a promise. It will not only helps us get along well with others, but also makes us a responsible person.One night, while I was doing my homework at home, I remembered that it was time to return a book to my classmate. However, it was very late and was raining heavily outside. “I must return it now,” I said to myself, because I made the promise. Without thinking twice, I put down my pen quickly and rode my bike to my classmate’s home. My classmate was shocked to see me. Since then, we has become closer to each other. As far as I’m concerned, our world will be more wonderful if all the people try their best to keep their promises.