pollutant

"Pit row was abuzz with activity."

"São Paulo is the largest city in South America."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The foreign student in my class has a different cultural background than the rest of us. "

"The car's exhaust was making a loud rumbling noise. "

"The scientist carefully examined the substance to determine its chemical composition. "

"My sister is very helpful, especially when it comes to organizing things. "

"The intricate making of the model airplane showcased the student's skill. "

"The villagers lived in unhealthy surroundings."

"What make of car do you drive?"

"The spilled juice impurely stained the white tablecloth. "

"Before the big presentation, Sarah took a deep breath and felt more calm. "