mercurous

"The prisoners were kept in a secure compound. "

"My math teacher recommended a specific textbook for extra practice. "

"The documents pertaining to my car insurance claim are now all submitted. "

"The oxidation of iron causes rust to form on metal objects. "

"The medicine helped my grandmother feel better after she had the flu. "

"The box containing my old toys was stored in the attic. "

"The box contained old photographs. "

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

"The computer technician fixed the broken printer in the school library. "

"The chemistry class focused on how different elements combine to form new substances. "

"The feeling is difficult to describe, but not unpleasant."

"The doctor recommended that Maria increase her intake of potassium chloride to help balance her electrolytes. "