Sort 47 Adding -able: When do you keep the e?

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Across
  1. 3. able to be pronounced or spoken clearly
  2. 6. able to be replaced with something else
  3. 7. suitable for cultivation or farming
  4. 9. capable of being exchanged or traded
  5. 11. not wanted or considered unfavourable
  6. 12. able to be consumed or used up
  7. 13. unable to be divided or separated into parts
Down
  1. 1. capable of being opposed or resisted
  2. 2. capable of being resumed or continued
  3. 4. causing enjoyment or satisfaction
  4. 5. able to be used again after being cleaned or repaired
  5. 8. capable of being saved or recovered
  6. 10. easily observed or perceived
  7. 14. unable to be seen with the naked eye