Answer:
1. P: I doubt that many _____ (power) species can be saved.
O: I am sure that a lot of _____ (can) be saved.
2. P: I don't believe that people____ (know) preserve nature.
O: On the contrary, I believe that people_____ (know) very well to preserve nature.
3. P: It is impossible for deforestation of the Amazon rain forest _____ (to stop).
O: On the contrary, it is possible that the deforestation of the Amazon rain forest _____ (stop).
4. P: I don't think ecology _____ (interest) people.
O: I think on the contrary that it _____ (interest) a lot of people.
5. P: It is not certain that there will ______ (have) a concert this evening; it will rain.
O: On the contrary, I am sure that there is _____ (to have) a concert this evening, because it is not going to rain.
6. P: I don't think Marie-Ange _____ (wanting) to come with me to the concert.
O: For once, you are right; I think she _____ (wanting) to go with someone who is happy.
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