`1.` T

`->` Dẫn chứng : Smoke and waste chemicals are polluting the air and our environment. 

`2.` F (harmful)

`->` Dẫn chứng : Smoke from cars, buses, trucks and motorbikes are very harmful.

`3.` T

`->` Dẫn chứng : We are producing too much trash. This is polluting the land, the rivers and the oceans, too. 

`4.` F 

`->` Dẫn chứng : We should save water and electricity. We shouldn't leave our trash in the country. We should collect used paper, bottles and cans. We can recycle them to save the natural resources.

`=>` Chúng ta có thể làm rất nhiều việc để có thể bảo vệ môi trường 

`5.` F

`->` Dẫn chứng : We should collect used paper, bottles and cans. We can recycle them to save the natural resources.