21.  Substantial time must be invested in checking the entire family for possible infestation and treating those infected.

22.  The early school years are so formative that more retired people should invest their time helping the children, Vastine said.

23.  The jockey invested his time, flying over from Hong Kong for a chance to set the pace in the Santa Anita Handicap.

24.  Too many people have invested time in him.

25.  When a new role is likely to be a one-shot, many singers balk at investing the time.

26.  Which path to pursue depends on your age, personal goals and how much time you can invest in training.

27.  While Ms. Kael was investing her time more wisely, the boys in the back room were soaking up the Hawks ethos.

28.  Who wants to invest the time to understand it?

29.  Why invest time on this man?

30.  You, I trust, will invest your time more carefully than they did.