I.

1. 1. B- warn
2. 2. D – fear
3. 3. C- bury
4. 4. C-pneumonia
5. 5. B- comb

6.C -psychology

II

1. 1. Depth
2. 2. Endangered
3. 3. Polluted
4. 4. discoveries
5. 5. investigate
6. 6. destruction
7. 7. extinct
8. 8. dangerous
9. 9. constant

10, disappearance

1. 11. established
2. 12. different
3. 13. contamination
4. 14. national

III

1. 1. would not have
2. 2. got
3. 3. had
4. 4. sold
5. 5. trusted
6. 6. bought
7. 7. went
8. 8. lived
9. 9. were
10. 10. would take
11. 11. would not have endured
12. 12. knew; would go
13. 13. had known
14. 14. missed, would be
15. 15. would forget; didn’t remind
16. 16. would go; were not
17. 17. would send; had
18. 18. would have; were
19. 19. hadn’t drunk; would have had
20. 20. hadn’t rained, would have come