In the reading room, we found her 　　　 at a desk, with her attention _____ 　　　 on a book. 

Bats are surprisingly long-lived creatures, some _____ a life span of around 20 years. 

Years later, he returned home, unexpectedly the old tree of his childhood__________.

With all things _______, we should follow his advice.

With the boy______ the way, we had no difficulty ______the village.