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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.
