Word riddles

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Across
  1. 3. What has hands but doesn’t clap?
  2. 5. A word I know, six letters it contains, remove one letter and 12 remains, what is it?
  3. 8. If two’s company, and three’s a crowd, what are four and five?
  4. 9. What has to be broken before you can use it?
  5. 11. When Michael was 6 years old, his little sister, Leila, was half is age. If Michael is 40 years old today, how old is Leila?
  6. 12. What goes up but never comes back down?
Down
  1. 1. David’s parents have three sons: Snap, Crackle and…?
  2. 2. What begins with T, finishes with T, and has T in it?
  3. 4. I’m tall when I’m young, and I’m short when I’m old, what am I?
  4. 6. I am an odd number. Take away a letter and I become even. What number am I?
  5. 7. What five-letter word becomes shorter when you add two letters to it?
  6. 10. If a red house is made of red bricks, and a yellow house is made of yellow bricks, what is a greenhouse made of?