29. It is still a bit ___________________________________ to use the Internet in everyday life.            (cost)
30. They showed a ______________________________________ about animal communication. (document)
31. She is one of the most active ______________________________________ of the campaign.   (preserve)
32. Certain chemicals have been banned because of their damaging effect on the _________________________.                                                                                         (environmentalist)
33. The fashion industry is always desperate to _______________________________________.                                                                                                                                                       (innovation)
34. It is __________________________________ proven that there is the relationship between lung cancer and smoking.                                                                                                                                      (science)

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