acetylene

"The metallurgy department at the university studies how to extract and refine metals for use in new alloys. "

"The car's headlights illuminated the dark road ahead, allowing the driver to see clearly. "

"The prisoners were kept in a secure compound. "

"The apéritifs were particularly stimulating."

"Gasoline is a hydrocarbon fuel used in many cars. "

"The simplest way to solve the math problem was to use the formula directly. "

"My formerly quiet neighborhood is now very busy with new construction. "

"The water from the well was surprisingly colourless, almost like air. "

"They were taken unawares and overcome when the room filled with a lethal, odorless gas."

"Construction is underway on the new bridge."

"The teacher's lesson plan was together, covering all the key concepts logically. "

"The desk lamp is illuminating my textbook so I can study better. "