11.   She had lost track of the movement ahead of her.

12.   Sherman had lost track of the grid pattern altogether.

13.   We teachers became mathematicians, seeing all these bloody points, but we lost track of the line.

14.   His mind would wander, and he would lose track of what he was doing.

15.   My engrossment in the video game made me lose track of time.

16.   Enthralled by the flickering fire in the hearth, we lost all track of time.

17.   I was so absorbed by her story that I lost track of time.

18.   Changing LOMEM in the middle of a program causes BBCBASIC to lose track of all the variables you are using.

19.   Somehow she seemed to have lost track of time.