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.