Answer:
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
Brown I am and much admired. Many horses have I tried. Tire a horse and worry a man, tell me this riddle if you can. What am I?
I am always coming but I never arrive. What am I?
You can see me in water, but I never get wet. What am I?
I am not very commonly found! Only in some rainforest! I have an odd number of toes! I'm very lazy and hang upside down! What am I?
No matter how little or how much you use me, you change me every month.