Duty is an act or a course of action that people you to take by social customs, law or religion.
All the neighbors admire this family, _________the parents are treating their child like a friend.
-----I have some big news for you. You’ve been accepted as a member of our club. -----_______ That’s great!
To save some of the human languages before they are forgotten, the students in our school started a discussion “Save Our ________”
Fred entered without knocking and, very out of breath, sank _______ a chair.
-----Did you watch the basketball match yesterday? -----Yes, I did. You know, my brother ________ in the match.