1. When offered invitations, gifts, or refreshments, Iranians believe, it is polite ——- them after a few times.

2. Frost occurs in valleys and on low grounds ——- on adjacent hills.

3. Any system consists of a number of organs ——- together.

4. According to the scientific method, a scientist must ——- any outcome a possible outcome.

5. One difficulty with driving at night is…………….. vision.

6. The committee needs a rest; they ——- a long session.

7. The ——- we are to our trip to Tehran, the more excited my students become.

8. We shall submit our assignments on time ……………. we do not lose the final score.

9. By the time you came to the laboratory, we ——- for several hours.

10. I could not finish the report ——-, so I asked my co-workers to help me out.

11. Before asking other people to share their notes with you, ——- some of yours with them.

12. Students ……………… classes at all until the internet has become so widely used.

13. You have to take full course of your antibiotics even if you feel better; ——-, your illness will return.

14. If you do not understand the text, do not hesitate ——-.

15. He studied hard; ——-, he passed all his courses successfully.

16. Ali, who is studying mechanical engineering…………… creative writing, but he realizes that you can’t always get what you want.

17. Our farmers in the valley eat most of what they produce, and ——- they do not eat, they sell.

18. Had I …………………my advisor’s advice, I would not have the problems that I have now.

19. I have been thinking………….. or not to take summer classes.

20. Some experienced teachers do all exercises for their students…………. Leave their students on their own.

21. We have now reached a stage ——- we can decide on other proposals.

22. Islamic Republic of Iran has a high literacy rate by regional standards, and in comparison to many other countries at similar levels of development, is a very ——- society.

23. Technology integration is important for students' motivation and ——- in the learning process.

24. Language can be a cause of miscommunication and ——- between people of different cultural backgrounds.

25. Our academic community ——- moves from the industry-oriented world towards the information-oriented ones.

26. A diverse workplace can significantly ——- team success, allowing for greater input from various sources.

27. Representations of culture and their ——- have a material aspect.

28. Student readiness is another crucial issue ——- while designing a technology-based learning system.

29. Teachers’ need to improve themselves ——- is closely related to the dynamic needs of their students.

30. Global ——- aims to develop inter-community relations to create respect and tolerance.