Choose the best answer A, B, C or D to indicate the correct answer to each of the following questions.
| 1. A. dangerous | B. endanger | C. endangered | D. endangerment |
| 2. A. extinct | B. extinction | C. extinctive | D. extinctly |
| 3. A. deep | B. depth | C. deepen | D. deeply |
| 4. A. penalty | B. penalize | C. penal | D. penalization |
| 5. A. decide | B. decisive | C. decisions | D. deicider |
| 6. A. import | B. important | C. importantly | D. importance |
| 7. A. communicate | B. communication | C. communicative | D. communicable |
| 8. A. widely | B. wide | C. width | D. widen |
| 9. A. apply | B. applicant | C. application | D. applicator |
| 10. A. disappoint | B. disappointed | C. disappointedly | D. disappointing |
| 11. A. industry | B. industries | C. industrial | D. industrialize |
| 12. A. electric | B. electricity | C. electrician | D. electrify |
| 13. A. construct | B. construction | C. constructive | D. constructor |
| 14. A. relax | B. relaxation | C. relaxing | D. relaxed |
| 15. A. friends | B. friendly | C. friendship | D. friendliness |
| 16. A. beautiful | B. beautifully | C. beautify | D. beauty |
| 17. A. interesting | B. interested | C. interest | D. interestingly |
| 18. A. attractive | B. attracted | C. attractively | D. attraction |
| 19. A. richly | B. enrichment | C. rich | D. enrich |
| 20. A. thoughtless | B. thoughtful | C. thought | D. think |
| 21. A. occupation | B. occupied | C. occupant | D. occupational |
| 22. A. scientists | B. science | C. scientific | D. scientifically |
| 23. A. signify | B. significance | C. significantly | D. significant |
| 24. A. environmentalists | B. environmental | C. environmentally | D. environment |
| 25. A. nature | B. naturally | C. natural | D. naturalness |
| 26. A. uncertain | B. certainty | C. certain | D. certainly |
| 27. A. prepared | B. preparation | C. preparatory | D. prepares |
| 28. A. treatment | B. treated | C. treatable | D. untreated |
| 29. A. discouraged | B. encouraged | C. couraged | D. courage |
| 30. A. capability | B. capable | C. capabilities | D. capacity |
| 31. A. succeed | B. success | C. successful | D. successfully |
| 32. A. nerve | B. nerves | C. nervous | D. nervously |
| 33. A. interest | B. interested | C. interesting | D. interestingly |
| 34. A. society | B. social | C. socially | D. socialize |
| 35. A. careless | B. careful | C. care | D. carefulness |
| 36. A. peacefully | B. peaceful | C. peace | D. peacefulness |
| 37. A. fertile | B. fertility | C. fertilize | D. fertilizers |
| 38. A. injection | B. injecting | C. inject | D. injected |
| 39. A. nation | B. national | C. nationality | D. international |
| 40. A. instruct | B. instructional | C. instruction | D. instructive |