完成短文 Changsha is now making its effort to become a national civilized city. As students, what should we do? We must respect our teachers and ____1___ (礼貌待人)others. We should also help those who are ____2___ (在危难中)and be friendly to the people around us. Besides, we must ____3___(遵守交通规则). When crossing the streets, we should walk on the zebra crossing. And we mustn’t go across the street when the traffic lights are red. What’s more, we should ____4___(保护环境). For example, we mustn’t step on the grass and climb trees. Litter mustn’t be thrown everywhere. Changsha is our hometown. Let’s ____5___(尽力)to make it better and better.