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"The poor ventilation in the classroom made it difficult to concentrate. "

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

"The combination of soft music and warm lighting created a relaxing atmosphere in the living room. "

"My sometimes neighbor, a retired teacher, still visits the school occasionally. "

"Our lunch consists of a sandwich, an apple, and a drink. "

"Professor Smith, the head of the history department, gave a fascinating lecture on the Roman Empire. "

"The birds had built an amazing structure out of sticks and various discarded items."

"The chemistry class focused on how different elements combine to form new substances. "

"Example sentence: "People with phenylketonuria (PKU) must carefully limit their intake of phenylalanine from foods like meat and dairy to prevent health problems." "

"Grandma used a generous amount of aromatic in her famous spaghetti sauce. "

"The alternate periods of rain and sunshine made for a very unpredictable afternoon. "

"Students need to buy their textbooks before the first day of class. "