Same letters, different sound

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Across
  1. 4. the number after seven
  2. 5. this can be measured in grams and kilograms
  3. 7. the planet we live on
  4. 8. to look for something you've lost
  5. 10. you would do this with a book
  6. 12. you could use a ruler or a metre stick to do this
  7. 13. the feeling of wanting something that someone else has
  8. 15. when you don't tell the truth
  9. 16. the opposite of day,
  10. 19. a pirate might be searching for this
  11. 20. an ingredient used to make a cake
Down
  1. 1. 'It's too dark, switch on the _____'
  2. 2. a desert made with a fruit filling like cherry or apple
  3. 3. something a man can grow with hair on his face
  4. 6. chicken, beef and lamb are examples of this
  5. 9. you use this to make a sandwich
  6. 11. the feeling of being afraid
  7. 14. a knight might use one of these
  8. 17. a large animal that lives in the woods
  9. 18. very hot countries experience this when they have little water