Riddles

12345
Across
  1. 2. what has lots of eyes,but can't see?
  2. 4. what has legs but doesn't walk?
  3. 5. what has to be broken before you can use it
Down
  1. 1. what is always in front of you but can't be seen ?
  2. 3. I m tall when I m Young,and I m short when I m old.what I am I?