it is +过去分词+to do造句
1. It is done to ensure quality control in production.
2. It is believed to have been caud by human activities.
3. It is necessary to have a valid passport to travel abroad.
4. It is rumored to be haunted by the ghost of a former owner.
5. It is customary to tip waiters in some countries.
6. It is required to wear safety gear on construction sites.
7. It is recommended to get regular check-ups with a doctor.
8. It is known to have been one of the largest earthquakes in history.
9. It is hoped to reduce traffic congestion with the new road system.
10. It is expected to take veral more years to complete the project.
11. It is forbidden to smoke in public areas.
12. It is common to u public transportation in denly populated cities.
13. It is believed to be the birthplace of modern civilization.
14. It is advisable to save money for unexpected situations.
15. It is said to be good luck if a black cat cross your path.
16. It is necessary to have a licen to operate heavy machinery.
17. It is considered impolite to interrupt someone while they are speaking.
18. It is recommended to take breaks during long periods of work.
19. It is understood to be a high-pressure job with long hours and demanding responsibilities.
20. It is required to have a permit to hunt in the national park.
21. It is customary to shake hands when meeting someone for the first time.
22. It is considered rude to talk loudly on your phone in public places.
23. It is important to wear sunscreen when spending time outdoors.
24. It is believed that eating spicy food can improve your metabolism.
25. It is mandatory to wear a atbelt when driving a car.
26. It is customary to leave a small tip for restaurant rvers in some countries.
27. It is thought that regular exerci can improve mental health and mood.
28. It is considered impolite to arrive late for a job interview.
29. It is recommended to get a good night's sleep to improve cognitive function.
30. It is believed that drinking warm water in the morning can aid digestion.
