She went about her work that morning humming under her breath.
He lighted the lantern, and Hal Dozier went down the steep steps, humming.
She knew the humming and hawing gentleman—had heard him often before.
They are all gone now, but then they were humming and teeming with work.
The air was full of laughter, talk, whistling and humming of the airs from the opera.
The purring and humming increased, and the car seemed to leap forward.
Sometimes a tune gets into my head and I have to keep on humming it or whistling it.
Thrice he had heard something that sounded like the humming of a swarm of bees.
One morning he heard her humming to herself at breakfast-time.
And the answer is so low that nothing but a humming bird may hear.