1.   His voice deepened as he relaxed.

2.   Her voice has deepened and coarsened with the years.

3.   As he pointed up the moral, contrasting the way of the good with the way of the bad, his voice deepened and became more indignant.

4.   But many others continued in sport when their voices deepened, when their body hair grew like ivy and when their ability expanded along with their muscles.

5.   Freeman wanted to be the lead singer of a quartet, but his voice deepened and he became a bass.