41.   As he neared her tent he heard the sound of crying.

42.   Peter heard the sound of gunfire.

43.   I kept hearing the sound of applause in the background.

44.   I heard the sound of a bolt being slowly and reluctantly slid open.

45.   She heard the sound of the guns thundering in the fog.

46.   We could hear sounds coming from within his apartment.

47.   We could hear sounds coming from within.

48.   They heard the sound of machine-gun fire.

49.   Though the sound could be heard clearly, it took me a long time to react.

50.   The most frightening thing of all was that not a sound could be heard.