3. A. competition B. environment C. experiment D. development 4. A. traditional B. conservation C. participate D. community 5. A. technology B. successfully C. community D. memorable 6. A. informative B. technology C. community D. conservation 7. A. necessary B. discovery C. behavior D. successfully 8. A. difficulty B. independent C. generally D. necessary 9. A. naturally B. behavior C. technology D. development 10. A. definition B. beautifully C. environment D. available 11. A. traditional B. available C. disadvantage D. experiment 12. A. literature B. exhibition C. comfortable D. television 13. A. identify B. operation C. beneficial D. celebration 14. A. similarly B. disadvantage C. operation D. inexpensive 15. A. disadvantage B. inexpensive C. popularly D. population 16. A. effectively B. everywhere C. television D. difficulty 17. A. participant B. unhappily C. education D. identify 18. A. population B. optimistic C. effectively D. interaction 19. A. independent B. operation C. destination D. communicate 20. A. comfortable B. environment C. agriculture D. memorable 21. A. information B. automobile C. education D. exhibition 22. A. education B. supermarket C. disappointed D. explanation 23. A. supermarket B. intelligent C. technology D. necessity 24. A. impossible B. introduction C. convenient D. beneficial 25. A. calculation B. temperature C. information D. commendation 26. A. dictionary B. nationally C. television D. interviewee 27. A. supermarket B. experiment C. environment D. activity 28. A. relationship B. situation C. emotional D. American 29. A. society B. logically C. biology D. communicate 30. A. information B. disappointed C. technology D. conversation Mọi người giúp em với ạ, em cần gấp, em cảm ơn nhiều !