One Student Missing

Sad to say, but it is nice when "that one student" is gone.  Today two students who are both "that one" was gone from two of the classes.  It made for such a relaxed day!  Not only did I not have to keep my eye on those students, but they also weren't there to distract the students around them.  Wouldn't it be nice to teach only the students who wanted to be there?  (Wait, that's kinda what I do when I teach college students!)  A solution would be to remove all students who distract from classroom learning... but then how do these students learn?  Are there resources for this?  It is unfair that a few students demand and require (and, unfortunately, often get) more than their share of the teacher's attention even though they don't often put forth the necessary effort toward learning.