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Many people believe we are heading for an environmental disaster(灾难)______ we radically(根本地) change ...

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if    but    unless    once  
Think  To think   Thinking  Thought  
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believe    believe in    fight for    fight against  
but  although  unless  once  
but    although    unless    if  
believe that most people are superstitious  believe that very few people are superstitious  believes that there are still some evidences of superstitions in what we say and what we do  is superstitious  

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