Use "be engrossed in" in a sentence

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