1.It is a fact that... (事实是...)2.It is honour that... (...非常荣幸)
3.It is common knowledge... (...是常识)
4.It is natural that... (...很自然)
5.It is strange that... (奇怪的是...)
6.It seems that... (似乎...)
7.It happened that... (碰巧...)
8.It appears that... (似乎...)
9.It is reported that... (据报道...)
10.It has been proved that...(已证实...)
11.It is said that... (据说...)