1. People will destroy our planet through pollution.

   • "Will destroy" is used to indicate a future action that is certain or expected.

2. We are going to do something to protect our planet. We have a campaign for it.

   • "Are going to do" is used to indicate a planned action in the near future.

3. Too much freshwater is used nowadays.

   • "Is used" indicates a current, ongoing situation.

4. Recently, serious climate changes have been caused by the greenhouse effect.

   • "Have been caused" is used for actions that started in the past and continue to the present.

5. Chemicals are overused by some farmers in their crops.

   • "Are overused" indicates a current, ongoing situation.

Mark the letter A, B, C, or D to choose the underlined part in each sentence that needs correcting:

1. The world economy would improve by the discovery of a cheap and non-polluting car.

   • Correction: "by" should be "with" or "through".

2. Remove chemicals outside of the house; use eco-friendly pesticides that won’t contaminated groundwater.

   • Correction: "outside of" should be "outside" and "contaminated" should be "contaminate".

3. In order to reduce our carbon footprint, we should replace the disposable items with the reuse.

   • Correction: "reuse" should be "reusable".

4. The hydrogen technology was still not invent in the 19th century.

   • Correction: "invent" should be "invented".

5. Deforestation is a serious problem in South America where cattle farmers have accused of cutting down large areas of forest to make room for cattle ranches.

   • Correction: "accused" should be "been accused