Answer:
What is easy to get into but hard to get out of?
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 throw away my outside you cook my inside. Then you eat my outside and you throw away my inside.
I have roots that no one sees and I am taller than trees. Up, up I go, but never do I grow. What am I?
I am lighter than air but a hundred people cannot lift me. Careful! I am fragile!
Give it food and it will live, give it water and it will die.