The famous Russian writer Lea Tolstoy（托尔斯泰）once said, " Everyoneof changing the world, but no one thinks of changing himself. "
He was right. We always plan or dream to do something great so that we can change the world. For example, we hate, so we try to find new energy sources（能源）to keep the environment clean. , we still litter on the ground in our lives. Also, we are not satisfied the traffic, so we plan to build more highways to solve it. But in fact, the main reason for it is that many people don' t follow the traffic rules.
Now, lots of students always think their homework is very difficult and find it hard to pass exams. In their eyes, the problems on their papers are too difficult. But actually the real reason is that they don' t study hard. They never think about changing their attitudes（态度）toward study working hard on their lessons.
In my opinion, before we decide to change the world, we should change ourselves first. As common people, it is notfor us to change the world, but we can easily give up our bad habits, such as littering（乱扔）, traffic rules and always complaining（抱怨）about how difficult the exam is. If we can do that, we' ll be strong enough to change the world some day and make .
