reagent

"The prisoners were kept in a secure compound. "

"The contamination of the water supply caused many people to get sick. "

"The chemist carefully measured the ingredients for the baking soda volcano experiment in science class. "

"The science students conducted their experiments in the school laboratory. "

"The mixture of flour and water was carefully stirred to make the dough. "

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

"In baking a cake, the flour, sugar, and eggs are the reactants that combine to form the final product. "

"a blood sample"

"My grandfather was a skilled industrial during the 1950s. "

"Set the tray there."

"Asphalt, composed of oil and sand, is a widely used material for roads."

""During the war, the refugees lived in guarded compounds for their safety." "