1. The ________ of the new vaccine took over ten years. (PERFECT)

2. His ________ as a witness made the case very difficult for the police. (RELY)

3. The ________ of the computer system was caused by a virus. (FUNCTION)

4. She is ________ known for her charity work around the world. (WIDE)

5. The ________ of the situation forced them to leave immediately. (URGENT)

6. His ________ behavior during the meeting was very embarrassing. (CHILD)

7. We need to ________ the old bridge for safety reasons. (STRONG)

8. The ________ of the car was so high that it couldn't be repaired. (MAINTAIN)

9. It is ________ to predict exactly when the volcano will erupt. (SCIENCE)

10. Her ________ was due to her constant hard work. (PROSPER)

11. The ________ of the two companies led to many job losses. (COMBINE)

12. He was ________ for his role in the failure of the project. (CRITIC)

13. The ________ of the forest is vital for the local wildlife. (ENLARGE)

14. She felt ________ when she realized she had lost her passport. (HELP)

15. The ________ of the internet has revolutionized education. (ADVENT)

16. He ________ the instructions and made a serious mistake. (INTERPRET)

17. The ________ of the medicine depends on the dosage. (EFFECT)

18. She is ________ of her brother's musical talent. (ENVY)

19. The ________ of the building was a masterpiece of modern art. (EXTERIOR)

20. He is an ________ person who never stops working. (EXHAUST)

21. The ________ of the mountain made the climbers very tired. (STEEP)

22. It is ________ to expect everyone to agree with you. (REASON)

23. The ________ of the documents was proved in court. (FALSE)

24. She spoke ________ about the need for environmental protection. (ELOQUENT)

25. The ________ of the lake was caused by industrial waste. (PURIFY)