Riddles

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Across
  1. 3. has a head and a tail but no body
  2. 5. has a back and 4 legs
  3. 6. single-digit number with no value
  4. 7. has words but never speaks
  5. 9. the more of this there is the less you see
  6. 11. always in front of you but can't be seen
Down
  1. 1. so fragile that saying its name breaks it
  2. 2. always coming but never arrives
  3. 4. has one head one foot and four legs
  4. 5. used in the kitchen to strain
  5. 8. always behind you and you can never go back
  6. 10. always found on the ground but never gets dirty