1. _____ he managed to survive the plane crash is a miracle.

2. I am not sure _____ the new policy will be implemented next month or not.

3. _____ the witness said in court surprised everyone.

4. The problem is _____ we don't have enough funding for the project.

5. _____ caused the massive power outage is still under investigation.

6. I don't know _____ she is so angry with me today.

7. _____ he is telling the truth remains to be seen.

8. The question is _____ we can finish the report by Friday.

9. _____ she decided to quit her job so suddenly is a mystery.

10. I am curious about _____ he will react to the news.

11. _____ you choose to do now will affect your entire future.

12. He didn't explain _____ he had been absent for three days.

13. _____ wins the election will face many difficult challenges.

14. I am concerned about _____ the environment is being destroyed.

15. _____ he said was completely different from the truth.

16. The reason _____ he failed the exam was his lack of preparation.

17. _____ you decide to go, I will follow you.

18. I am not certain _____ I left my keys this morning.

19. _____ he is capable of doing the job is not in doubt.

20. She couldn't remember _____ she had parked her car.

21. _____ we need is a more efficient way of working.

22. He asked me _____ I would be interested in the new position.

23. _____ simple the task may seem, it requires great care.

24. It is not clear _____ will be appointed as the new CEO.

25. _____ he arrived late for the interview didn't help his chances.