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