XI

1. if you don't exercise more, you can't have a good health ( unless= if not )

2. too many telephone poles, advertising bilboards and shop signs cause visual pollution

3. if we don't take action ( hành động ) immediately, the air will become completely polluted

4. both weeds ( cỏ dại ) and aquatic(adj/ dưới nước ) plants die off herbicides ( thuốc diệt cỏ ) 

5. if many people respected the enviroment, it won't be in danger now

6. since ( ở đây hiểu là bởi vì ) the water is contaminated,  people get more diseases

7. because of breathing in unclean air, my uncle suffered from lung cancer ( ung thư phổi )

8. the street will look more attractive if people stop throwing rubbish in the street

9. due to the heavy rain, the road in front of my house was flooded

10. light pollution may result of using too much of electric light in cities