Countable and uncountable nouns

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Across
  1. 2. plural form of wife
  2. 4. plural form of a Knife
  3. 6. singular form of feet
  4. 9. singular form of children
  5. 10. most of the population in the classroom.
  6. 12. uncountable noun of something we breathe every day.
  7. 13. unique individual in the classroom.
Down
  1. 1. plural form of leaf
  2. 3. uncountable noun of something that we need to activate in order to see in the dark
  3. 5. singular form of teeth
  4. 7. uncountable noun of something that is very fragile
  5. 8. uncountable noun of something that we need to survive
  6. 11. uncountable noun of something we stand on every day.