The day we built 3

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Across
  1. 2. to improve something by making small changes to it
  2. 3. to spend money on something in order to make it better or more successful
  3. 5. having the ability or qualities necessary for doing something
Down
  1. 1. able to change to suit new conditions or situations
  2. 4. an organized set of ideas or theories or a particular way of doing something
  3. 6. a quantity of something
  4. 7. prevent something bad from happening the enormous extremely large