Mary is sitting in the front row, her head bent over her book; she is clearly paying very close attention.

So, apparently, are the two girls who sit behind her - at least, their gazes are both fixed on Professor Wolfe.

Just until the moment his back is turned to write something on the chalkboard, at which point Susie quickly taps Lacey on the shoulder and drops a piece of paper in her lap.

I could listen to his voice all day.