"U" sounds - Gummy Bears

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Across
  1. 2. a suitable amount
  2. 5. happens without warning
  3. 7. a part of a song which is repeated after each verse
  4. 9. a married man
  5. 10. least smooth
  6. 12. something found for the very first time
  7. 13. starving
Down
  1. 1. trains goes through these
  2. 3. another name for a referee or sports official
  3. 4. greatly astonished or amazed
  4. 6. not as old
  5. 8. continents are divided up into these
  6. 9. these are in the second decimal place
  7. 11. this accompanies lightning