TWO LETTER WORDS

1. OF: Have you seen painting of Mona Lisa?
2. It is a portrait of a beautiful woman. 
3. 
   His offer of this painting was not accepted.
4. In days of old, people used to travel on donkeys.
5. Church visit is the duty of the Roman Catholics.
6. Money these days will make you a man beloved of all your friends.
7. I often think of this but still I disagree.
8. This dish is made of gold.
9. It was made of gold for Midas wanted it.
10. His daughter too was made into gold.
11. That was because of his greed.
12. ON:
13. On Sundays, Christians go to the church.
14. Muslims go to the mosque on Fridays.
15. Hindus go to the temples on all days.
16. Labor day is celebrated on 1st of May.
17. Father gave him a valuable gift on his birthday.
18. I saw a big parcel ,half-opened  on my arrival there.
19. It was lying on the table.
20. This Poona express arrives always on time.
21. Can you give a speech on how to improve my English?
22. You can't go on drifting if you want to succeed.
23. He voluntarily retired on attaining the age of sixty.
24. Some cities are built on the sea.
25. You may be on holiday when you read this blog.
26. Electronic items will be on sale from next Friday.
27. This book was given on loan by the society.
28. You must always go on and on till you attain your object.
29. Put on your thinking cap and start learning.
30. Keep the lights on when you go in the dark lanes.
31. What's on your program tonight?
32. OR:
33. No matter whether your eyes are blue or black ,your eyesight must be perfect.
34. Either my wife or myself must attend the function.
35. Either you listen to a speech or read a good book to keep you going.
36. Hurry up or you will be late.
37. You must carry a pen or a pencil if you are a writer.
38. OX.
39. The ox was pulling the plough with the other ox.