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"Archaeologists carefully dig in the dirt, looking for clues about past civilizations. "

"The train tracks are two parallel lines that run through the entire town. "

"The protective helmet was essential for the construction worker. "

"He discovered penicillin largely accidentally."

"The magician was revealing his trick by showing how the disappearing box worked. "

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

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"The children were drawing with chalk on the pavement outside their house. "

"The project consists of three main parts. "

"The ancient pyramids have stood for centuries, witnessing the rise and fall of civilizations. "

"The children sat on the kerbstones while waiting for the school bus. "

"The workers excavated the site to build the foundation for the new school. "