1. I learned all the irregular verbs __________ heart when I was at school.

2. Who is the girl that you were talking __________ when I saw you?

3. There has been a sharp fall __________ the price of oil recently.

4. Don't worry, the documents are __________ safe keeping in the bank.

5. I'm sorry, I can't talk now. I'm __________ my way to a meeting.

6. The building was __________ fire, but luckily everyone escaped.

7. I prefer to discuss this matter __________ private if you don't mind.

8. What is the reason __________ your sudden decision to leave?

9. There has been a significant rise __________ the cost of living.

10. You should take pride __________ your work if you want to succeed.

11. I'm not __________ very good terms with my boss at the moment.

12. He is very skilled __________ negotiating difficult contracts.

13. The keys are hanging __________ the hook behind the kitchen door.

14. The manager is __________ a lot of pressure to meet the target.

15. The car is __________ excellent condition despite its age.

16. I heard the news __________ the radio on my way home.

17. The two countries have been __________ peace for decades.

18. There has been a steady increase __________ the number of tourists.

19. You can contact the department __________ email or by phone.

20. He is a specialist __________ renewable energy sources.

21. I'm writing to you __________ behalf of the whole class.

22. She has a lot of influence __________ the final decision.

23. The exhibition is __________ display at the local gallery.

24. I didn't break the window __________ purpose; it was an accident.

25. The flight was cancelled due to a fault __________ the engine.