Answer:
I can be short and sometimes hot. When displayed I'm never cold. What am I?
I begin your sentences.
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
What three letters change a boy into a man?
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.