Unit1

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Across
  1. 3. make it easier for sth. to happen
  2. 7. completely necessary
  3. 8. make it difficult for sb. to do sth.
  4. 10. having knowledge or understanding
  5. 11. take part in
  6. 13. cause the failure of sth.
Down
  1. 1. an accurate or deep understanding of sth.
  2. 2. a state of order and control; self-control
  3. 4. decide to use for a particular purpose
  4. 5. be useful or helpful to
  5. 6. make sth. stronger
  6. 9. make sb. feel ashamed, nervous, uncomfortable
  7. 12. come into being; appear; happen