Select the most appropriate word from the options against (9).
Petroleum or crude oil is one of the world’s __(6)__ natural resources. Plastic synthetic fibres and __(7)__ chemicals are produced from petroleum. It is also used to make lubricants and waxes. __(8)__, its most important use as fuel for heating, for __(9)__ electricity and __(10)__ for powering vehicles.
generating
being generated
to generate
generated
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