low compared to personal another require
running out of refers to economic positive limited
Any mode of transport is deemed sustainable if it has a_④ environmental impact and uses little or no fuel. Walking is the best example of sustainable transportation, as it does not⑤any gas. However, walking can be impractical if you are travelling longer distances. Cycling is_⑥___ green transport option and is a far more practical option for longer commutes.

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4. low 5. require 6. another

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1 low compared to personal another require
running out of refers to economic positive limited
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