111.  The human voice is the richest instrument.

112.  The human voices are offset by drum beats evoking the marching of soldiers, the impact of shells and the beating of human hearts.

113.  The sitar, an age-old stringed instrument, sounds like a clear, passionate human voice when Shankar is at his best.

114.  The SES chief, however, believed the human voice will remain the main mode of business in stock trading.

115.  The SES chief, however, believed that the human voice will remain the main mode of business in stock trading.