Viết lại câu:

6. After / the Earth Hour / be/  over, / we / save / a lot of power.

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7. A fire started as soon as the boys / leave / campsite.

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8. You / should/  make / a shop/ list / before / you / go shopping.

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9. The villagers/ have / electricity/  until/  they / install / new generator.

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10. Whenever/  you / can,/  follow / three R’s / conserve/  natural resources.