r-controlled vowels (er, ir, ur)

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Across
  1. 3. 6 + 3 + 4 =
  2. 4. clowns, tigers, acrobats
  3. 7. to give back
  4. 8. to give someone their food
  5. 9. a type of evergreen tree
  6. 10. covers the outside of mammals
Down
  1. 1. likely to cause injury
  2. 2. happen; take place
  3. 5. this will become a butterfly
  4. 6. the season with no school