He was busy writing a story, only _____once in a while to smoke a cigarette.
He was about to leave ___ Tom arrived so he stayed a little longer.
Each statue is of a person who has made a ___ in American history.
The official ___ whom we applied ___ a permit was most warm-hearted.
Many of the survivors are being ___ burns and other injuries at local hospitals.
The number of people who ___ in position of professional skills and knowledge ___ shrinking.