Answer:
Goes over all the hills and hollows. Bites hard, but never swallows.
Snake coiled round and round. Snake deep below the ground. Snake that's never had a head. Snake that binds but not with dread.
Thirty men and ladies two, gathered for a festive do; Dressed quite formal, black and white; soon movement turned to nasty fight.
Three little letters. A paradox to some. The worse that it is, the better it becomes.
What has a mouth but can't chew?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?