er, ir, ur

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Across
  1. 3. The feeling you get when you need a drink of water
  2. 4. To pop or break open suddenly
  3. 7. Someone who participates in a game or sport
  4. 9. A medical helper who takes care of sick people in a hospital
  5. 10. The number that comes after twelve
Down
  1. 1. Three groups of ten
  2. 2. To speak very quietly so only nearby people can hear
  3. 5. To rotate or change direction
  4. 6. A person who makes bread and cakes in an oven
  5. 8. Paying close attention; ready and watchful