4*4

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Across
  1. 3. something that you must do
  2. 7. Something that is not connected by wire
  3. 8. Quality in achieving a work
  4. 10. the money you keep
  5. 11. A system that converts energy
Down
  1. 1. something that costs a lot of money
  2. 2. To buy something
  3. 4. A situation when you make something better
  4. 5. A subject that is studied
  5. 6. something or someone can be trusted to do or provide what is needed
  6. 9. A person that need something or a service