Answer:
When you buy me I am costly, but the only use I have is hanging only. What am I?
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
You can see me in water, but I never get wet. What am I?
I'm sometimes white but most often I'm black. I take you there but never bring you back.
I go around in circles, but always straight ahead, never complain, no matter where I am led.
When is it bad luck to see a black cat?