If we ... ( to use) car less, our air ... (to be) much cleaner.
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7. If we ... ( not to stop) wasting water, we ... (to be) thirsty in future.
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8. We ... ( to have) more oxygen if we ... (to stop) cutting down trees.
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9. Some species... (to become) extinct if people ... (not to stop) hunting them.
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1 балл