pollutants

"Pit row was abuzz with activity."

"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. "

"During the winter, smoke billowed from the chimneys of the houses in our neighborhood. "

"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 spilled juice impurely stained the white tablecloth. "

"He released his grasp on the lever."

"The family-owned factory in China handled the export of toys to many countries. "

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

"The complicated instructions on the new software difficult me from completing the project on time. "