The work you hand in must be strictly your own.
These days, there are many programs available not only from your classmates and friendly upperclassmen, but also on the web. Of course, I am as aware of these things as you are -- maybe even more -- than you are.
It is only fair for you to know that I have a pocket full of tools that will help me and the TA's detect whether you are doing your own work or not.
If we suspect that you are not doing your own work, I will ask you to come see me so that we can discuss the matter. If you cannot convince me that my suspicions are unwarranted, then I may have to send your case to a disciplinary committee that has the right to expel you from the University.
Please, let's not go there. I've been there before, and believe me, it's not fun for any of us.