1. We are all aware _____ the importance of environmental protection.

2. His opinion is different _____ mine.

3. If you don’t pay attention _____ the teacher, you won’t understand the lesson.

4. I’m not familiar _____ his name, but his face seems familiar to me.

5. We were very grateful _____ our friends for all of their assistance.

6. The children are really excited _____ their summer vacation.

7. We were very disappointed _____ the organization of the festival.

8. John missed a lot of lessons. He was ill _____ January to March.

9. Helen had said goodbye to everybody in the class _____ she left for the hometown.

10. My cat is very fond _____ fish.

11. Many vegetables, including tomatoes and corn, are native _____ the New World.

12. This style of architecture is typical _____ the Colonial period.

13. Oxygen, fuel, and heat are all necessary _____ combustion.

14. This apartment would be too crowded for two people, but it is perfect _____ one.

15. This variety of seed is inferior _____ the type I planted last year.

16. Ann looked _____ the mirror and admired her new blouse.

17. The new manager's name is familiar _____ most of us.

18. Those books deal mainly _____ tropical plants.

19. _____ the game last evening, my cousin hurt his ankle.

20. Water consists _____ oxygen and hydrogen.

21. You must settle the matter _____ yourselves.

22. He spoke _____ a whisper.

23. He was ill _____ fever.

24. I came on Monday at ten o'clock _____ the morning.

25. He made himself pleasant _____ visitors.

26. I shall wait _____ you.

27. What do you think _____ this sonata of Beethoven?

28. If you earn a good salary, you can be independent _____ your parents.

29. Ottawa is _____ Canada.

30. A bird _____ the hand is worth two _____ the bush.