genuine

"My friendship with Sarah has lasted for many years. "

"The school's stock of pencils was low, so the teacher asked the students to save them. "

"His argument was spurious and had no validity."

"The native student explained the customs of her home village to the class. "

"This manuscript is the original."

"The store owner discovered a counterfeit bill in the customer's payment. "

"The restaurant owner adulterated the tomato sauce with water to save money, but it ruined the flavor. "

"The old stone building had a series of grotesque antique figures, or gargoyles, guarding its roof. "

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

"To proceed on a journey."

"The widget making machine is being used for production now."

"Where does this document belong?"