1. She has suffered _____ her heart attack.

2. Most children are ill-prepared _____ employment.

3. English belongs _____ those who use it.

4. Four-fifths of the world's computers use programs _____ English.

5. My father insisted _____ building a new house.

6. We are proud _____ our people's heroic tradition.

7. The streets are crowded _____ vehicles at the rush hour.

8. The air at the seaside is good _____ health.

9. I'm not acquainted _____ those flowers.

10. Your words are contrary _____ your acts.

11. He is sad _____ his son’s laziness.

12. The book is divided _____ three parts.

13. We are grateful _____ our teacher.

14. I'm interested _____ current events.

15. Your profession is similar _____ mine.

16. I was absent _____ class before yesterday.

17. Teachers are responsible _____ their teaching.

18. The beach is full _____ tourists in summer.

19. We were present _____ the lecture yesterday.

20. That singer has become very popular _____ the youth.

21. He is negligent _____ his duties.

22. The car went _____ full speed.

23. He was _____ himself with rage.

24. Gas is made _____ coal.

25. He suffers _____ headaches.