hydrocarbons

"The prisoners were kept in a secure compound. "

"The pencil's lead is made of carbon. "

"Hydrogen is the simplest chemical element, with only one proton in its atom. "

"My only is my younger sister; she's the only child in our family. "

""Homes, can you help me carry these groceries?" "

"The new student was a natural from Japan. "

"It is difficult to provide for my family working on minimum wage."

"The project consists of three main parts. "

"By now, you must surely know which is which."

"He burned his manuscript in the fireplace."

"The students were mostly quiet during the presentation. "

"The air we breathe is made of tiny atoms like oxygen and nitrogen. "