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15. ________ has become a hot topic among people, especially among the young, and heated debates are right on their way. 16. Recently, ________ has become the focus of the society, and in this way.. People swarm to ________. 17. ________ 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. 18. Man is now facing a big problem-________, which is becoming more and more serious. First, ________ second, ________. 19. Nowadays more and more people are beginning to be aware of the seriousness of ________. 20. It is only during the last years that man has become generally aware that ________. 21. There is an old saying, ________. Its the experience of our forefathers, however, it is correct in many cases ever today. | 
