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Lesson 13

1. flame
2. flammable
3. ignite
4. ignition
5. precise
6. precision
7. meter
8. metric
9. microscope
10. microscopic
11. grave
12. gravity
13. grateful
14. gratitude
15. revise
16. revision
17. athlete
18. athletic
19. humane
20. humanity
Lesson 14

1. eruption
2. spectacular
3. abrupt
4. spectator
5. spectacle
6. description
7. specimen
8. interruption
9. subscribe
10. disrupt
11. inspector
12. rupture
13. respect
14. manuscript
15. speculate
16. aspect
17. transcribe
18. inscription
19. suspect
20. bankrupt
Lesson 15

1. mystery
2. literary
3. treachery
4. theory
5. bravery
6. primary
7. legendary
8. forgery
9. cemetery
10. elementary
11. observatory
12. secretary
13. nursery
14. satisfactory
15. imaginary
16. vocabulary
17. ordinary
18. machinery
19. boundary
20. temporary
Lesson 16

1. ballet
2. technique
3. fatigue
4. debut
5. petite
6. amateur
7. bouquet
8. massage
9. antique
10. vague
11. portrait
12. boulevard
13. reservoir
14. debris
15. boutique
16. plateau
17. coupon
18. dept
19. plaque
20. crochet
Lesson 17

1. nucleus
2. nuclei
3. bacterium
4. bacteria
5. analysis
6. analyses
7. diagnosis
8. diagnoses
9. criterion
10. criteria
11. datum
12. data
13. thesis
14. theses
15. fungus
16. fungi
17. oasis
18. oases
19. cactus
20. cacti