NERDY RIDDLES

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Across
  1. 1. Life cannot exist without me
  2. 3. I fly without wings what am I?
  3. 4. If you look at me, I look at you, if you smile, I smile - what am I?
  4. 5. I am a word but become a flask with two letters
  5. 7. I am an odd number but become even when you take a letter away from me
  6. 8. What has a neck but no head
Down
  1. 2. I always run run but never walk
  2. 3. I have hands but cannot clap
  3. 6. I am full of holes but can hold water - what am I?
  4. 9. Everything to gain but nothing to lose