1. Her disappearance has never been …………………………. explained. (satisfy) 2. Do you know the …………………………. of that word? (pronounce) 3. I’m pleased to hear you had an …………………………. summer vacation. (enjoy) 4. Don’t you know the …………………………. of self-study? (important) 5. Her parents are …………………………. with her good behavior. (pleasure) 6. Our project wouldn’t be …………………… without your kind cooperation. (succeed) 7. You don’t have to …………………………. the grammar rules to be able to do these exercises. (memory) 8. You have to …………………………. those English vocabularies every day. (revision) 9. She actively …………………………. in social work last year. (participation) 10. His …………………………. towards her is becoming more and more aggressive. (behave) 11. We used to …………………………. in many activities of communal center. (participation) 12. I can do all of these exercises …………………………. (easy) 13. He was …………………………. of his achievements in the field of politics. (pride) 14. Both company managers put their ……………… at the bottom of the document. (sign) 15. Her …………………………. prevented her from success. (nervous) 16. We finished the test …………………………. (excellence) 17. The teacher is pleased with the …………………………. in my study. (improve) 18. Food and clothing are …………………………. of life. (need) 19. You don’t have to remember these words because they are …………………………. (importance) 20. …………………………. is necessary in learning words. (revise) 21. We are going to Hue tonight to …………………………. the festival with my family. (celebration) 22. His mom takes …………………………. in him. (proud) 23. We spent our summer vacation …………………………. (enjoy) 24. We had …………………………. deciding who to send to the compaction. (difficult) 25. Her English ……………………… very fast since she studied at this center. (improvement) 26. They always …………………………. kindly towards their neighbors. (behavior) 27. She looked back on her career with great …………………………. (satisfy) 28. Sarina is only my half-sister because we have …………………… mothers. (differ) 29. The teacher was concerned about the …………………………. smell in the laboratory and told the students to leave. (please) 30. We are looking forward to our next …………………………. (cooperate)