1. I’m sorry, I deleted your file ___ mistake.

2. We’ve been ___ a lot of pressure at work lately.

3. The police believe the fire was started ___ purpose.

4. The two countries are currently ___ war with each other.

5. I’m afraid this model is ___ of stock at the moment.

6. Many people are ___ the impression that the tax will be abolished.

7. You can’t smoke here; it’s ___ the law.

8. We need to get the project finished ___ all costs.

9. I haven't seen her for ages, but we still keep ___ touch.

10. The situation is now ___ control, so there’s no need to panic.

11. You should try to learn these irregular verbs ___ heart.

12. I’m not sure if I can help you, but I’ll do my best ___ any case.

13. The building has been ___ sale for over six months now.

14. I was ___ the middle of a meeting when you called.

15. Please stay calm and don't get ___ a panic.

16. She’s been ___ a very bad mood since she woke up.

17. The train arrived exactly ___ schedule.

18. I’m writing to you ___ regard to your recent inquiry.

19. It’s hard to believe that this house is ___ risk of collapsing.

20. We are ___ no obligation to provide a refund.

21. I’m not really ___ the mood for going out tonight.

22. Could you please put the books back ___ place?

23. They have a lot ___ common even though they are very different.

24. I’ve been living in this city ___ the time being.

25. The local hospital is ___ threat of closure.