=>
XII/
1. unpolluted 
2. contaminated 
3. damage 
4. deadly 
5. poisonous
6. pollution 
7. damaging 
8. untreated 
9. contaminant 
10. death

XIII/
1. to 
2. of 
3. from 
4. into 
5. with
6. on 
7. to 
8. in 
9. with 
10. of

C/

1. What is water pollution?
2. Why is the river water heavily contaminated?
3. How many major types of pollution are there?
4. What would you do if you were the President?
5. Where does most of the plastic waste end up?
6. What are common effects of exposure to radioactive waste?
7. Which City is more polluted, Ho Chi Minh City or Da Nang?
8. How often is garbage collected in your neighborhood?
9. Who is responsible for solving environmental issues?
10. How can land pollution be prevented?