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To prevent the deserts coming near, China has planted billions of trees---to replace destroyed fores...

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He was afraid that someone would steal his box.  Because he wanted to climb up along the rope.  He fastened the end of the rope in order to keep the box unmoved.  Because he wanted to prevent the box from coming down.  
had meant coming      had meant to come      meant to come      meant coming  
attaching to    applying to    looking forward to   paying attention to  
asteroids racing across the night sky are likely to hit Earth in the near future  workable solutions still have to be found to prevent a violent coming course of aster olds with the earth  the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime  while pushing asteroids off course nuclear weapons would destroy the world  

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