Rewrite the following sentences, using the words in brackets. 

1. Water in the Cau River becomes brown and has terrible smell because the waste water is released from the paper mill in Thai Nguyen City. (so)

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 2. Nga ate a big dinner. She had a stomachache. (since)

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3. Global warming happens when there is too much carbon dioxide (CO2) in the atmosphere. (causes)

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4. Because plastic bags take so long to decompose, nearly all of them still exist in the environment today. (so)

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5. We can’t see the stars at night. There is too much light pollution. (due to)

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6. Ngoc’s mother is upset because she doesn’t tidy her room every day. (if)

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7. We regret it in the future. We use too much energy now.(if)

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8. People use too much herbicide to treat weeds, so water in rivers. canals, lakes are extremely polluted and has bad effects on people's health. (because)

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9. Household dump waste into the river. It is polluted. (so)

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10. Aquatic life suffers or dies because there is thermal pollution. (because of)

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 11. Noise pollution happens. There is a change in animals’ living pattern. (leads to)

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12. There are asthma, allergies and other respiratory illnesses when air pollution happens. (leads to)

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13. Acid rain is dangerous. Trees’ leaves are damaged. (because of)

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14. Mai is ill now, so she doesn’t participate in this useful activity. (if)

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15. Earth gets warmer. The sea level rises. (If)  

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16. Many fish in the river die due to the increased temperature of water. (because)

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