1.It pays in the long run to introduce new technique

　　2.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 individuals happiness and sense of personal achievement.

　　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 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

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