Fill in the gaps with the correct particle. 1) Do you like my new bag? It's made out ............... recycled materials.
2) Wildlife can be at risk if synthetic chemicals build ............. in the environment.
3) We should start using alternative energy sources in case we run out .......... fossil fuels.
4) Ethanol is mixed with petrol to turn it .................. a fuel that can power engines.
5) Nowadays, there are electric cars that run ................ solar energy.

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