Silent letters

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Across
  1. 4. our favourite type of addition and subtraction
  2. 6. people at weddings or parties
  3. 9. an old-fashioned hero
  4. 10. not from our country
  5. 11. a spikey plant
  6. 15. one of the four seasons
  7. 16. someone who can fix a leak
Down
  1. 1. feeling sad ir down
  2. 2. you may feel/have this about a certain subject
  3. 3. telling the truth
  4. 5. grown ups pay monthly to own houses
  5. 7. what we do when a grown up is speaking
  6. 8. a violent sport
  7. 12. surrounded by water
  8. 13. a baby sheep
  9. 14. they stand outside to protect the Queen