开头段

　　1)

　　In this essay, I would like to discuss the causes for this problem and explore the possible solutions to it.

　　2)

　　After close inspection (examination), I would assume that the following factors could lead to (attribute to, account for, result in) it.

　　3)

　　Diverse contributing factors can be identified. In the following, I would like to present my point of view.

　　4)

　　What factors lead to this unpleasant phenomenon and what we can do to solve this problem becomes a great concern among many people.

　　5)

　　What explains the growing trend of juvenile crime? In the following, I would like to explore the causes for it and find out some useful solutions to it

　　6)

　　At present, the issue of environment has been in the focus of the public.

　　7)

　　Nowadays, the problem of unemployment is a very serious problem confronting us, which has aroused wide (great) concern among people.

　　8)

　　Recently, the issue of animal protection has become the biggest concern of the present –day world.

　　第二段

　　1)

　　There are several major causes for the traffic problem. One cause is that…Another cause is that… The most frequently stressed one is…

　　2)

　　There are numerous reasons for it, and I would explore only a few of the most important ones here.

　　3)

　　There are several reasons for it. First…Second… In addition…Last but not least.

　　4)

　　Private cars may cause (lead to, bring about/on, give rise to )the serious traffic problems.

　　5)

　　Playing games for a long time will have (exert, bring about/on) an unfavorable (bad, harmful) effect on the development of one’s intelligence.

　　第三段

　　In view of the seriousness of this problem, effective (urgent) measures must be taken before things get worse.

　　From the above mentioned, we can say that it is high time that the government should take measures to eliminate Industrial pollution.

　　In order to improve the environment, we should take the following measures.

　　结尾段

　　To sum up, mankind must put an end to pollution or pollution will put an end to mankind.

　　Let us work hand in hand to hold back a growing trend of crimes.

　　We must cry for (call for) an immediate action (method, measure) to correct the present situation. If permitted to continue, it will surely (certainly) to lead to the end of some animals.