Utiliser "be engrossed in" dans une phrase

1. She pretended to be engrossed in her bathing to cover her reaction

2. which everything is born, is life, whereas to be engrossed in the innu-

3. There are some, no doubt, for whom he is the perfect guide; people who come here to listen to the silence or to be engrossed in the study of nature, will not find a better guide than him