Direction: ​Read the following passage and fill in each blank with words chosen from the options given.

Petroleum, or crude oil, is one of the world's (1) ----- natural resources. Plastics, synthetic fibers, and (2) ----- chemicals are produced from petroleum. It is also used to make lubricants and waxes. (3) -----, its most important use is as a fuel for heating, for (4) -- --- electricity, and (5) ----- for powering vehicles.