Firstly , as a teacher I\'m obliged to appreciate every and each student ; specially those hardworking student like Nancy , starting from this point , I would make sure to appreciate her wide knowledge and the hard work she made through out the course  . Then I would encourage her to speak and elaborate her opinion as much as she want but  without taking the time and chance of other students .I would say that Nancy and all students knows that interrupting others is misleading behavior , the enthusiasm of Nancy is very strong which made her very comitative student , which a thing that I strongly appreciate and I encourage every student to become like you Nancy , but let\'s give your classmates a chance to tell there point of view about the question I asked , then I will give you the chance to comment on his/her point of view  to agree or disagree . then I will address the question again to the Student , this time Nancy would not interrupt and she may feel a little shy of her previous act .When the student answers my question I would not comment on his answer rather than ask student to comment on his/her answer . When I make sure that every student who have a comment has took his/her chance , I will ask Nancy in particular to comment on his/her answer and I would appreciate all answers equally .