Linda,
Try to get them all engaged but realize that you won't be able to reach everyone. This was a hard lesson for me to learn as a new instructor but I realized after a while that I was fulfilling my professional obligations and that the end result rested with the students. If you have tried competitions, games, and other engaging activities and still they won't respond you are dealing with issues that are outside of the classroom and they are bringing pressure on the students. They don't see the value and/or application of the content and the probably never will. Sad but a part of what we face as educators.
Gary
Gary Meers, Ed.D.