/ 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.
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