Exercise 13 1. A. accept B. interaction C. advancement D. untamed 2. A. undisturbed B. another C. pessimistic D. epidemic 3. A. release B. retirement C. appear D. implement 4. A. transform B. exhilarate C. precaution D. rigorous 5. A. environment B. attention C. adaptable D. auditory 6. A. convey B. describe C. approval D. testimony 7. A. communicate B. infect C. descendent D. regulate 8. A. infection B. disaster C. public D. surround 9. A. unsinkable B. effective C. disease D. positive 10. A. approach B. involve C. expose D. garbage Exercise 14 1. A. nominate B. susceptible C. resistant D. recovery 2. A. eliminate B. domesticate C. unlimited D. sabotage 3. A. substantial B. technological C. exponential D. infiltration 4. A. immunity B. pursuit C. perfection D. confident 5. A. accompany B. unfinished C. contagion D. separate 6. A. athletic B. lucrative C. conservative D. distinguish 7. A. predecessor B. competition C. indestructible D. democracy 8. A. outstanding B. minority C. determined D. evidence 9. A. material B. indestructible C. phenomenon D. evidence 10. A. facility B. believe C. however D. approximate