Long vowel U

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Across
  1. 3. what i learned, from knowledge
  2. 7. toothpaste comes in this
  3. 10. a horse with a horn
  4. 11. not false
  5. 12. never been used before
  6. 13. what a plane did yesterday
  7. 14. I ....... a knife to cut the cake
  8. 16. clean, fresh - water or air
  9. 17. to stick things together
  10. 18. people who work on a plane or ship
Down
  1. 1. present of did
  2. 2. a ........ of inquiry in school
  3. 4. to change direction
  4. 5. a 3D square shape
  5. 6. holds pieces of wood or steel together
  6. 8. what a fire can do
  7. 9. something I can play on a music instrument
  8. 13. not many
  9. 15. to turn down the sound
  10. 17. what a plant did from seed to flower