1. The explosion was so powerful that it reduced the building ______ an unrecognisable tangle of metal and bricks.

2. I’m really sorry ______ your car, Sally; I promise to pay for the repair work as soon as possible.

3. Most teenage boys in this neighborhood are mad ______ football and sports in general.

4. Lean the paintings ______ the wall gently, please, so they don't fall over and break.

5. Farmers should be careful because this chemical is extremely harmful ______ the environment.

6. I was really mad ______ him for lying to me about where he was last night.

7. She’s mad ______ politics these days and spends all her time reading the news.

8. You should keep this medicine in a high cabinet to ensure it is safe ______ children.

9. I feel sorry ______ her because she’s had a very hard life since her parents passed away.

10. I feel sorry ______ what I said yesterday; I didn't mean to hurt your feelings.

11. I’m tired ______ waiting for him in the rain; let's go home without him.

12. He’s very weak ______ Physics, so he needs a tutor to help him pass the final exam.

13. She was wrong ______ accusing him without proof, and now she owes him an apology.

14. There’s no reason ______ his strange behaviour lately; he seems like a different person.

15. The villagers were under threat ______ attack from the bandits hiding in the forest.

16. Please be careful and don’t do any damage ______ the furniture while you are moving the boxes.

17. Shame ______ you for behaving like that at a formal wedding ceremony!

18. The refugees found shelter ______ the storm in a small cave near the mountain.

19. You should beware ______ dogs in this area as some of them can be quite aggressive.

20. They headed ______ the station as soon as they heard the news that the last train was leaving.

21. He leaned ______ the wall and waited for his friend to come out of the shop.

22. This heavy leather jacket will protect you ______ the cold during the winter trip.

23. He was punished ______ breaking the rules of the school for the third time this month.

24. She is recovering ______ a serious illness and needs to rest for a few more weeks.

25. The company reduced costs ______ improve efficiency and increase its annual profit.