1)It is widely acknowledged ( recognized ) that extensive deforestation contributed to heavy summer flooding.
2)It is reported that 800000 applicants sat for the National Master’s Entrance Test in 2003.
3)It is estimated that two thirds of the cities of our countries will be in acute shortage of fresh water by 2010.
4)It is generally accepted that to practise euthanasia on a patient who is still alive is inhuman.
5)It must be admitted that the price war will disturb the normal order of the market. (admittedly)
6)It cannot be denied that the overgrowth of tourism may destroy the ecological balance of some scenic resorts.
7)It is known to all that physical exercises can improve and enrich our physical and mental well-being.
2.It is +形容词+ that…(形容词+ly，也可)
1)It is obvious ( evident, clear, undeniable, apparent) that the situation is caused directly by excessive commercial fishing.
2)It is understandable(inevitable) that people’s attitudes are divergent on this controversial issue.
3)It is unimaginable (incredible/unbelievable) that such a boy of 17 should have had three novels published.
3.It is +形容词+ for sb (sth ) to do sth
1)It is important (vital) for everyone to participate in physical exercises, for they will do good not only to our body but also to our mind and personality.
2)It is currently difficult for a university student to find an ideal job upon his graduation, especially those majoring in fundamental courses such as history and mathematics.
3)It is highly necessary for our government to stop the corruption of government officials.