5 ex 10.1.6 10.5.2 Put the sentences in the correct order 1-5. Which is the topic sentence? Suggest an alternative. A This means they are much better for the environment. B Therefore, they don't release additional carbon dioxide into the air. C First of all, they are carbon neutral. D There are many advantages to using biofuels in our vehicles. E In addition, they release fewer toxic fumes when they are used.

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