1. As it is described that

　　2. It has been illustrated that

　　3. It provides a good example of

　　4. We may cite another instance of

　　5. History man provides us with the examples of

　　6. A number of further facts may be added

　　7. The situation is not unique, it is typical of dozens I have heard.

　　8. A recent investigation indicate that

　　9. According to the statistics provided

　　10. According to a latest study, it can be predicted

　　11. There is no sufficient evidence to show that

　　12. All available evidence points to the fact that

　　13. Examples given leads me to conclude that

　　14. It reveals the unquestionable fact that

　　15. The idea may be proved by facts

　　16. All the facts suggest that

　　17. No one can deny the fact that

　　18. We may face the undeniable fact that