If man keeps polluting the enviroment, earth will be in danger.

If we drump all sorts of chemicals into rivers, we won’t be able to swim in them.

If we don't stop cutting down so many trees, we will endanger our oxygen supply.

If the global temperature rises, sea levels will rise too.

If more people use reusable shopping bags, there won’t be so much waste.

If people don't use water more wisely, ,they will run out of drinking water one day.

Is everyone turns off inwanted lights, we will save a lot of electricity.

Đáp án:

1 - g ; 2 - f ; 3 - a ; 4 - b ; 5 - c ; 6 - d ; 7 - e 

1. g

2. f

3. a

4. b

5. c

6. d

7. e