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1)There are three reasons for this.
2)The reasons for this are as follows.
3)The reason for this is obvious.
4)The reason for this is not far to seek.
5)The reason for this is that...
6)We have good reason to believe that...
There are three reasons for the changes thathave taken place in our life.Firstly，people’s livingstandard has been greatly improved.Secondly，mostpeople are well paid， and they can afford what they need or like.Last but not least，more andmore people prefer to enjoy modern life.
注：如考生写第一个句子没有把握，可将其改写成两个句子。如：Great changes have taken place inour life. There are three reasons for this.这样写可以避免套用中的表达失误。
1)It has the following advantages.
2)It does us a lot of good.
3)It benefits us quite a lot.
4)It is beneficial to us.
5)It is of great benefit to us.
Books are like friends.They can help us know the world better，and they can open ourminds and widen our horizons.Therefore，reading extensively is of great benefit to us.
1)It has more disadvantages than advantages.
2)It does us much harm.
3)It is harmful to us.
However，everything divides into two.Television can also be harmful to us.It can do harm toour health and make us lazy if we spend too much time watching television.
1)It is important(necessary，difficult，convenient， possible)for sb.to do sth.
2)We think it necessary to do sth.
3)It plays an important role in our life.
Computers are now being used everywhere，whether in the government，in schools or inbusiness.Soon， computers will be found in every home，too.We have good reason to say thatcomputers are playing an increasingly important role in our life and we have stepped into theComputer Age.
1)We should take some effective measures.
2)We should try our best to overcome(conquer)the difficulties.
3)We should do our utmost in doing sth.
4)We should solve the problems that we are confronted(faced)with.
The housing problem that we are confronted with is becoming more and moreserious.Therefore，we must take some effective measures to solve it.
1)We cannot ignore the fact that...
2)No one can deny the fact that...
3)There is no denying the fact that...
4)This is a phenomenon that many people are interested in.
5)However，that’s not the case.
We cannot ignore the fact that industrialization brings with it .the problems ofpollution.To solve these problems， we can start by educating the public about the hazards ofpollutionThe government on its part should also design stricter laws to promote a cleanerenvironment.
1)Some changes have taken place in the past five years.
2)A great change will certainly be produced in the world’s communications.
3)The computer has brought about many changes in education.
Some changes have taken place in people’s diet in the past five years.The major reasons forthese changes are not far to seek.Nowadays，more and more people are switching from grainto meat for protein，and from fruit and vegetable to milk for vitamins.