过去 :1.学校小,教室少而且陈旧,屋内光线暗；2.只有几名老师；3.校园内花草树木少；4.操场小.
现在：1.有两座高大的教学楼,室内光线好,还有电脑室和图书馆；2.老师增多了；3.校园内花草树木随处可见；4.有篮球场和足球场.

    Great changes have taken place in our school in the past few years.

    I hope our school will become more and more beautiful in the future.

Most people don't  that they   polluted air.

Noise pollution can cause    as well.

We need to  the local .