91.   They have to be loud because when a sound is broadcast its wavefront advances as an ever-expanding sphere.

92.   In both cases the sounds are audible to humans, not ultrasonic like the more specialized bat clicks.

93.   When she got downstairs, there was no sound at all.

94.   She traced a pattern over the rough-hewn stone of the sill, while behind her there was no sound of retreating footsteps.

95.   Downstairs there were sounds of activity.

96.   Celia got up and followed her into the kitchen, and there were muffled sounds of crying.

97.   There had been no sound from the cockpit area.

98.   She went to the door and listened, but there was no sound from the other side.

99.   There was a long time -- several lifetimes -- when the only sound was the clatter of the rain against the window, then Vitor walked to the cot.

100.   Their sound is hard to sum up.