cleans

"The fisherman cast his line into the lake. "

"The old mirror had many small blemishes on its surface, making it hard to see a clear reflection. "

"The school directory lists the names and phone numbers of all teachers and staff. "

"Buying more servers would improve performance."

"The school required all students to submit their application documents to prove their enrollment. "

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

"The backpack was heavy, and it hurt her shoulders. "

"The farmer butchered the pig and then sold the meat at the market. "

"The camping equipment was essential for a successful weekend trip. "

"The automatic child-frightener made clowns unnecessary."

"Previously, I had planned to study for the math test on Saturday. "

"The foundation of his institute has been wrought with difficulty."