5. History man provides us with the examples of…

4. We may cite another instance of…

3. It provides a good example of…

2. It has been illustrated that…

1. As it is described that…

15. Taking into account all these factors, we may safely reach the conclustion that…

14. It is high time that we put considerable emphasis on…

13. None of the solutions is quite satisfactory. The problem should be examined in a new way.

12. There is no immediate solution to the problem of …, but …might be helpful

11. There is little doubt that…