27. In recent years, there is a general tendency to ______________. According to a study, there is ______________. compared with ______________ last year. Why ______________?

26. “Why do ______________?” Many people often ask questions like this.

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

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

23. ______________ 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.

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

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

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

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

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