Now air pollution has become a serious problem. As we know, none of us likes pollution.The government

has done something useful to protect the environment. What should we do as students? We shouldn't leave

rubbish here and there. Don't spit everywhere. Don't step on the grass or pick the flowers. Everyone should

care for wild animals and plant more trees. We should do everything we can to protect the environment.

(答案不唯一)