1. Rarely ________ such a display of courage in the face of adversity.

2. It is imperative that the research ________ conducted under strict supervision.

3. Had it not been for the goalkeeper's ________ reflexes, they would have lost.

4. The witness was seen ________ the scene of the crime in a hurry.

5. The decision to close the factory ________ a wave of protests across the city.

6. On no account ________ the alarm be disabled during working hours.

7. I would sooner you ________ the truth than kept me in the dark.

8. The company is on the ________ of a significant technological breakthrough.

9. Regardless ________ the consequences, he decided to speak up against the injustice.

10. You should keep this medicine handy ________ an emergency.

11. By the time the sun sets tonight, we ________ for over ten hours.

12. I found the lecture to be ________ boring and repetitive.

13. The more you invest in the stock market, ________ the potential risk.

14. He acts as though he ________ the most important person in the room.

15. The bridge, ________ by a team of international engineers, is a marvel of technology.

16. The company's failure is ________ to poor management decisions.

17. I didn't ________ to offend anyone with my remarks.

18. Only after months of training ________ to run a full marathon.

19. The report ________ the importance of renewable energy sources.

20. He was ________ with fraud and identity theft by the authorities.

21. I ________ to inform you that your application has been unsuccessful.

22. She ________ a great deal of effort into preparing for the presentation.

23. He is the only candidate ________ possesses all the required skills.

24. If only I ________ more attention to the instructions at the beginning.

25. The task was ________ complicated for a novice to follow.