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  • 1. When gasoline is burnt to power cars and trucks, it (produce) carbon monoxide.
    2. Carbon monoxide is harmful when it (concentrate) in great amounts.
    3. If the air in a city (get) very polluted, it can make people’s eyes burn.
    4. If smog is frequently formed in a city, it (cause) difficulty in breathing, headaches and even lung cancer.
    5. Some cities that suffer from extreme smog, issue air pollution warnings. If you (live) in Hong Kong, you would often hear official warnings not to go outside or engage in strenuous physical activity (such as running or swimming).
    6. Unfortunately, we only recently discovered how air pollution contributes to global warming. If we (know) about it earlier, we might have taken stricter measures in time.
    7. We (be) happy if air pollution were the only problem.
    8. Water pollution (result) when oil or chemical waste leak into oceans and lakes.
    9. There is great hazard from buried chemical waste, too. If we (not bury) chemical waste underground, we wouldn’t pollute fresh water supplies. This happened in the 1970s to people who lived in the Love Canal area in Niagara Falls, New York. They suffered from extremely high rates of cancer and birth defects. It was discovered that a chemical waste dump had poisoned the area’s water.
    10. If the chemical waste hadn’t poisoned the area’s water, 800 families (not/abandon) their homes.
    11. Unfortunately, pollution wouldn’t be such an issue if we -governments and common people- really (care).

  • 1. When gasoline is burnt to power cars and trucks, it (produces carbon monoxide.
    2. Carbon monoxide is harmful when it (concentrates in great amounts.
    3. If the air in a city (gets very polluted, it can make people’s eyes burn.
    4. If smog is frequently formed in a city, it (causes difficulty in breathing, headaches and even lung cancer.
    5. Some cities that suffer from extreme smog, issue air pollution warnings. If you (lived in Hong Kong, you would often hear official warnings not to go outside or engage in strenuous physical activity (such as running or swimming).
    6. Unfortunately, we only recently discovered how air pollution contributes to global warming. If we had known about it earlier, we might have taken stricter measures in time.
    7. We would be) happy if air pollution were the only problem.
    8. Water pollution (results when oil or chemical waste leaks into oceans and lakes.
    9. There is great hazard from buried chemical waste, too. If we didn't bury) chemical waste underground, we wouldn’t pollute fresh water supplies. This happened in the 1970s to people who lived in the Love Canal area in Niagara Falls, New York. They suffered from extremely high rates of cancer and birth defects. It was discovered that a chemical waste dump had poisoned the area’s water.
    10. If the chemical waste hadn’t poisoned the area’s water, 800 families wouldn't have abandoned) their homes.
    11. Unfortunately, pollution wouldn’t be such an issue if we -governments and common people- really (cared