1、In my opinion/ view, ...
2、As far as I know, ...
3、According to statistics/ research, ...
4、It is commonly/ widely believed that ...
5、Taking all these factors into consideration, ...
6、On the one hand, ..、on the other hand, ...
7、To sum up/ In conclusion, ...
8、It goes without saying that ...
9、Furthermore/ Moreover/ Besides, ...
10、Last but not least, ...
