2 examples of preoccupying in sentences

So constant and preoccupying, indeed, were they, that he once or twice believed he was on the eve of learning something regarding her.

Thus my mind, tortured by one preoccupying thought, had, thanks to the fixed idea which swayed it, found wondrous lessons in the simple incident of my cousin's return, otherwise so devoid of interest; and I may truly say that the lesson learned from meeting my cousin taught me more than all those I had received in the space of three years.

2 examples of  preoccupying  in sentences