contamination

"The factory's waste contaminates the nearby river, making the water unsafe to drink. "

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

"My mom laid a beautiful tablecloth on the dining table before dinner. "

"The development of this story has been slow."

"The oil spill is contaminating the ocean and harming the wildlife. "

"The student used the new vocabulary list to learn the names of different flowers. "

"The historical romance novel was a bestseller in the bookstore. "

"The new student was considered an undesirable in the class because of his disruptive behavior. "

"The teacher wrote the math problem on the whiteboard so the students could see it clearly. "

"The science class experimented with different substances to see how they reacted to heat. "

"A portion of your mortgage payment goes to reduce the principal, and the rest covers interest."

"The attachment of the student's name tag to their backpack was a simple but necessary step before class. "