21.   The only sound was the crunch of their feet on the crusted snow.

22.   The other sound was more disturbing still-a faint yet piercing scream, or howl.

23.   The piano sound is good, if a trifle harsh of tone in places.

24.   The recorded sound is slightly close and not always as flattering as it might be.

25.   The sheer efficiency of the drivers, especially at high volumes, can be disconcerting, and the sound is exceptionally bright.

26.   The sound had only been Isaac, but as Alan turned, he saw what was wrong with the trees.

27.   The sound is inaudible to the human ear.

28.   The sound of gunfire is an everyday experience in the city.

29.   The sound of waves is the finest way to be lulled to sleep!