`5.`

1. The development of industrial zones, factories and building construction areas

2. Yes they do

3. Because the smoke from vehicles and manufacturing exhaust increase the amount of carbon dioxide in the air which makes us feel really hard to breathe

4. Smog and dust can do serious harm to our health and especially our lungs

5. Moreover, acid rains are becomning more and more popular which damage crops and fields

`6.`

1. Many rivers and lakes are poisoned because factories produce waste and pour it into rivers and lakes.

2. If John didn't live in the area affected by air pollution, he wouldn't have breathing problem.

3. You shouldn't put so much salt in the soup

4. My mother enjoys listening to folk song in her free time as this helps her to reduce stress

5. I spend two hours walking in her village.

6. Minh drives more carelessly than Trung so he often has had an accident.

Task 5:

1. The development of industrial zones, factories and building construction areas is producing a large amount of dust and poisonous air.

2. Yes, they do.

3. Because the smoke from vehicles and manufacturing exhaust increases the amount of carbon dioxide in the air.

4. Lungs.

5. The harmful effect of acid rains is damaging crops and fields.

Task 6:

1. If farmers didn’t use too many pesticides and herbicides/ if farmers used fewer pesticides and herbicides, the soil wouldn’t be poisoned.

2. If John didn’t live in the area affected by air pollution, he wouldn’t have breathing problems.

3. You shouldn't put so much salt in the soup.

4. My mother enjoys listening to folk songs in her free time as this helps her to reduce stress. 

5. I spend two hours walking in her village.

6. Minh drives more carelessly than Trung so he often has had an accident.