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It's necessary for us    animals in danger. A.protect B.protecting C.to protect D.protected

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it , protect    its, to protect    it’s , protecting    it , to protect  
are  was  is  will have been  
this, for    it, of    this, of    it, for  
It, of, to    This, of, of    It, for, to    This, for, to  
it    that    this    its  
vital, happy    important, healthy    necessary, health    vital, healthy  
to us to return   for us to return    to us returning   that we had returned  
interesting, to become    important, to      good, to    necessary, to be  
The US economy is gradually recovering from the steep declines.  The Fed should take in account the shift in its outlook on economy.  It is not the proper timing for the Fed to consider rate interests.  It is necessary that the Fed make adjustments to its monetary policy.  
lower the production cost  hire a better designer  improve its quality  alter its image  
this    that    them    it  
keep    keeping    to keep    kept  
this   that   it   them  
by that    at that    on that    in that  
it    that    this    its  
this    that    it   what  
for     to     of     with
  

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