The lady was so absorbed in her job that she didn't hear a customer ________ at the door.
In the reading-room, we found Winifred ____at a desk, with her attention _____on a novel.
No matter where he is, he makes_____ a rule to go for a walk before breakfast.
___ to give up smoking, he threw away his _____ cigarettes.
By the time he retires, professor Baker _____ for almost forty years.
The managers discussed the plan that they would like to see ______ the next year.