| 1. to arise | A. to change |
| 2. unconscious | B. to provoke |
| 3. to substitute | C. to come to understand |
| 4. to modify | D. to result in |
| 5. to precipitate | E. to find solutions |
| 6. to probe into | F. to result from |
| 7. to appreciate | G. to replace |
| 8. to attempt | H. repressed |
| 9. to arrive at solutions | I. to explore |
| 10. to arise out | J. to aggravate |
| 11. to exacerbate | K. to try |
| 12. to lead to | L. to occur |
Key: 1L; 2H; 3G; 4A; 5B; 6I; 7C; 8K; 9E; 10F; 11J; 12D.