Is there a way to make a form that allows the user to select multiple answers from a dropdown?

Hi,

I work for a school that is building a form right now, and one thing we would like to do is have a list of teachers that can be selected from a drop down menu, effectively allowing the user to choose four or five from a list of twelve. Is there a way to do this? I see checkboxes, but that doesn't seem like a good answer for something that has twelve choices. I rolled through the other examples, and they all were single choice.

Thanks,

Lee