2、There is an interesting and instructive picture which goes like this: ______________.

　　3、Nowadays there is a growing concern over ______________. Many people like ______________, while others are inclined to ______________.

　　4、Nowadays, it is common to ______________. Many people like ______________ because ______________. Besides, ______________.

　　5、 ______________, just like many other things, are preferred by ______________. While being attacked by the idea that ______________, some people consider ______________. They point that ______________.

　　6、Everything has two sides and ______________ is not an exception, it has both advantages and disadvantages.

　　7、For years ______________ had been viewed as ______________. But people are taking a fresh look at it now.

　　8、It has stipulated by the government that ______________. To this stipulation, many people respond actively because ______________.

　　9、______________ is a common occurrence in our daily life. Whatever we do, ______________ can't be avoided.

　　10、______________ has become a hot topic among people, especially among the young, and heated debates are right on their way.

11、Recently, ______________ has become the focus of the society, and in this way.. People swarm to ______________.

　　12、______________ has been playing an increasingly important role in our day-to-day life. It has brought us a lot of benefits but created some serious problems as well.

　　13、Man is now facing a big problem-______________, which is becoming more and more serious. First, ______________ second, ______________.

　　14、Nowadays more and more people are beginning to be aware of the seriousness of ______________.

　　15、It is only during the last years that man has become generally aware that ______________.

　　16、There is an old saying, ______________. It's the experience of our forefathers, however, it is correct in many cases ever today.

　　17、The English proverb says, ______________. This is quite true because ______________.

　　18、______________ is now______________, and at the same time ______________. These two factors have caused ______________. Then what shall we do to solve ______________ in the face of such a situation.

　　19、One of our ancient philosophers said, ______________. Chinese people have always been holding this idea to be one of their standards of morality.

　　20、One of the great early writers said that ______________. If this is true, the present situation should make us ponder over ______________.