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.
Two in a whole and four in a pair. Six in a trio you see. Eight's a quartet but what you must get is the name that fits just one of me.
I'm a word that's hardly there. Take away my start and I'm an herbal flair. What am I?
I ask no questions, but receive a lot of answers. What am I?
I am black within and red without With four corners round about.
When is it bad luck to see a black cat?