Exercise 1:

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Across
  1. 4. a worker
  2. 7. to think carefully about something
  3. 8. unsure, unclear, unknown
Down
  1. 1. to look into or discuss something in detail
  2. 2. change, growth or progress
  3. 3. to change your behaviour for new conditions
  4. 5. to make sure something happens
  5. 6. the good things about something