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 that have taken place in our life.
Firstly, people's living standard has been greatly improved.
Secondly, most people are well paid, and they can afford what they need or like.
Last but not least, more and more 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 in our life. There are three reasons for this. 这样写可以避免套用中的表达失误。
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 in business.
Soon, computers will be found in every home, too.
We have good reason to say that computers are playing an increasingly important role in our life and we have stepped into the Computer 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 more serious.
Therefore, we must take some effective measures to solve it.
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 for these changes are not far to seek.
Nowadays, more and more people are switching from grain to meat for protein, and from fruit and vegetable to milk for vitamins.
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 of pollution.
To solve these problems, we can start by educating the public about the hazards of pollution.
The government on its part should also design stricter laws to promote a cleaner environment.
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