1. I hope these black marks will clean off.

2. A lighthouse marks the entrance to the harbour.

3. Only ambitious students get the best marks.

4. Your good marks gratify me very much.

5. I can't get these marks out of my T-shirt.

6. The river marks the eastern perimeter of our land.

7. He gained full marks in the examination.

8. Rub out chalk marks with an eraser.

9. He got 90 marks for Chinese.

10. He beat his closest/nearest rival by 20 marks.

11. Does he have any distinguishing marks?

12. Grease marks can be removed with liquid detergent.

13. Who made these dirty marks on my new book?

14. I got through with good marks.

15. Scuff marks from shoes are difficult to remove.

16. The mother sponged crayon marks off.

17. The President's official visit marks the start of a more fraternal relationship between the two countries.

18. There were dirty marks on her trousers where she had wiped her hands.

19. The fence marks the boundary between my land and hers.

20. Most of the pupils' marks were in the upper third of the range.

21. The Spring Festival marks the beginning of the Chinese Lunar New Year.

22. She rubbed out those dirty marks on her white skirt.

23. Not all patterns and marks seen on aerial photographs represent archaeological sites.

24. One snowy morning footprints and tyre marks were imprinted in the snow.

25. A simple plaque marks the spot where the martyr died.

26. She began rubbing out the pencilled marks in the margin.

27. After years of gardening,(sentencedict.com) the marks of the spade were impressed on the skin of the old gardener's hands.

28. Our teacher isn't fair: he always gives the highest marks to his favourites.

29. The possibility of enhancing one's knowledge is limitless.Graduation only marks a stage of one's education.Unceasing acquisition of knowledge will unceasingly escalate us to ever higher and higher attainments.

30. I hope my teacher will take into account the fact that I was ill just before the exams when she marks my paper.