1.It is advisable to exercise patience in dealing with such complicated situation

2.It is advisable to place important telephone numbers next to the phone in case of an emergency

3.It is biologically reasonable for deer to reduce their cost of living to increase their chances of surviving in winter.

4.It is essential that the increase in production should be geared to the increase in public demand

5.It is necessary that young and old people should communicate more with each other

6.It is thoughtless of some parents to allow their children to watch whatever program is on television

7.It is incredible (不可思议)that he ate the big cake just in two bites

8.It was obvious to everyone that the marriage would sooner or later end in separation if not divorce.

9.It was clear that Dad could do no more than he was doing already

10.It is certain that fresh air and exercises are more valuable than medicine

11.It is certain that with determination and hard work you will succeed eventually

12.It was quite apparent that both sides were making a great effort to win the prize

13.It was almost impossible for an Indian to gain even a fair education and extremely difficult ,as a result, for an Indian to rise high in life

14.It is easy to size up (估计)the situation right now. For we are not well informed on recent developments

15.It is not easy to say exactly what each part of the brain does.

16.It is not wise to change your money into U.S. currency

17.It is only recently that science has begun to give us some idea of how the brain really works

18.It will take the council a few weeks to judge the situation before it takes any further action

19.It is well known that many of our problems are caused at least in part by failure to communicate

20.It remains unknown whether there are intelligent beings outside the solar system

21.It is reported that the electronic industry is going on rapidly in recent year

22.It is reported that there has been a decrease in the annual birth rate over the last two decades.

23.It seems to me that the Americans are a highly mobile people. Most of them like to travel whenever they get the chance

24.It seemed to me that the only thing that mattered was to get her husband back to her.

25.It is an encouraging sign that people’s purchasing power is on the rise

26.It is common knowledge that people benefit a lot from reading extensively

27.It used to be a popular belief that we could foretell a person’s future on the basis of the date and time of his birth.

28.It pays in the long run (从长远地角度看)to introduce new technique

29.It may well come as a surprise to learn that not only psychologists but other behavioral scientists have come to accept the positive contribution of work to the individual’s happiness and sense of personal achievement.