11.   The idea of doing our duty is deeply ingrained in most people.

12.   The living room also does duty as a home office.

13.   The military court reprimanded him for failing to do his duty.

14.   The old girl should do her duty and send me a postcard if she can take the time off from her toy-boys.

15.   The sofa does double duty as a guest bed.

16.   Their duty done, the whole gang ran as fast as possible back to the engine and gathered in the cab.

17.   There was no cheering on the part of the men, but a stubborn determination to obey orders and do their duty.

18.   You failed to do your duty as a soldier and succeeded in overthrowing the most legitimate government the nation has ever had.

19.   Following the example set by her father, she has fulfilled her role and done her duty.

20.   We have followed the dictates of our consciences and have done our duty.