“The computers hum softly, their murmur subdued beneath the hubbub created by students as they chat.”

“Mother would commonly hum or sing while she got ready, and sometimes I would sing along or just listen.”

“Windsor and the surrounding towns hum with great places to eat, drink, and be as merry as a monarch.”

“He was humming the song aloud and loudly, louder in fact than any man would have hummed it had he expected to bump into another human being.”

“The organist often crackled or whined the Gregorian-chant hymns and the celebrant often hummed, mumbled, or whispered the Latin prayers.”

“Rue fumed silently as he hummed contentedly and she watched him closely, studying his movements and actions.”