His anxiety about his future keeps him awake at night.

He was anxious about the results of the exam.

Oil is an important element of the world economy.

Mineral oil is often used in the manufacture of cosmetics and pharmaceuticals.

The lamp went out because the kerosene ran out.

He often takes things out of context, leading people to misunderstand.

She was delighted to find the ring.

This dish uses olive oil, which has been used since ancient times.

He is an expert in petrochemistry.

This product is a reimport.