One of the reasons given for is that
There are a variety of reasons for this dramatic growth in First Second Finally
Why are (is/do/did) ? For one thing For another
History is filled with the examples of
As is shown in the table released by the government, it can be learned that
There is (no) good evidence to
We must admit the undeniable fact that
No one can deny the fact that
Experience (Evidence) suggests that
The same is true of
结尾段的常用核心句型
It is high time that we placed great emphasis on the improvement of
It is high time that we put an end to the unhealthy situation (tendency/phenomenon) of
There is no easy solution to the problem of , but might be useful.
Unless there is a common realization of , it is very likely that
It is essential that effective measures should be taken to prevent the situation.
It is suggested that great efforts should be made to control the growth of

