$14.$ Aviation gasoline, designed for $\_\_\_\_\_\_\_\_$ engines, must have high $\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_$ to ensure performance and safety.

$15.$ Diesel oil, utilized in $\_\_\_\_\_\_\_\_$ engines, is distinguished by its higher $\_\_\_\_\_\_$ point, $\_\_\_\_\_\_,$ and $\_\_\_\_\_\_\_\_$ compared to gasoline.

$16.\_\_\_\_\_\_\_\_,\_\_\_\_\_\_,$ and $\_\_\_\_\_\_$ are key environmental conditions required for the formation of petroleum, which originates from the decomposition of ancient $\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_$ under high pressure and heat.

$17.$ The primary global regions known for their substantial petroleum reserves include the $\_\_\_\_\_\_\_\_$ Sea, the sands of $\_\_\_\_\_\_,$ and the vast offshore areas of $\_\_\_\_\_\_\_\_,$ which contribute significantly to the global oil supply.