11.   Food producers do their best to make sure that food is not contaminated with any food poisoning organisms.

12.   Harry did his best to sound calm, but it was obvious that he was really annoyed.

13.   He did his best to boost the sagging morale of the civil service.

14.   He did his best to dodge trouble and minimize the number of people who considered him an enemy.

15.   He did his best to paper over the cracks.

16.   He emerges as a man with a big heart and a clever mind who did the best he could in difficult circumstances.

17.   He had done his best to make Harvey feel at home.

18.   He hoped the man was on the right track and did his best to believe that he was.

19.   He wanted to do his best the first time he performed, and knew he was not in peak condition.

20.   He was doing his best to be cooperative.