1. I’m sorry, I forgot your birthday __________ mistake.

2. The police are looking __________ the disappearance of the diamonds.

3. He is very good at remembering names __________ heart.

4. The project is now __________ control, so don't worry.

5. We’ve run __________ of sugar. Can you buy some?

6. The situation came as a surprise, right __________ the blue.

7. I’m looking forward __________ seeing the new movie.

8. He takes __________ his father; they both love fishing.

9. The firefighters put __________ the fire quickly.

10. You can't rely __________ him to keep a secret.

11. I bumped __________ an old classmate at the library.

12. He is feeling __________ the weather and won't come to the party.

13. The car broke __________ on the way to the wedding.

14. Everything is __________ schedule, so the building will open on time.

15. I’m fed up __________ the constant rain this week.

16. The meeting was called __________ because of the strike.

17. She succeeded __________ winning the scholarship.

18. He was caught __________ guard by the unexpected question.

19. The plans look good __________ paper, but will they work?

20. I’m not __________ liberty to tell you his private number.

21. The business is __________ the brink of a major breakthrough.

22. I heard the news __________ the grapevine.

23. He is a bit __________ of practice at playing chess.

24. She decided to give __________ sweets for a month.

25. The house was __________ fire when the neighbors arrived.