网址：http://m.1010jiajiao.com/timu3_id_2932367[举报]
________(污染) air is harmful to your health.
Air ______(污染) are beginning to draw more and more attention.
与很多受污染的城市相比，青岛的空气干净多了。(compared with)
.______________________________(受到严重污染), it may be a bit too late to protect the river.(suffer)