retractable

"I turned the key, the lock gave a click and the door opened;  a click of one’s fingers"

"My son's writing homework included practicing cursive letters. "

"The being in the classroom was quiet today. "

"As everyone knew, he was capable of violence when roused."

"The presentation had five key points. "

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

"My father was a strong influence on me."

"The use of torture has been condemned by the United Nations."

"The artist was signing his name on the bottom of the painting. "

"My work schedule is very demanding this week. "

"The cat's claws are retractile, allowing it to walk silently without scratching the floor. "

"An airplane retracts its wheels for flight."