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Sadly, some of the species of birds are e________ and we’ll no longer see them.

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in which   on which   to which   for which  
mix with  do well on  exist in  float on  
sad   sadly    sadness    sadnessly  
sad; sad   sadly; sadly   sad; sadly   sadly; sad  
sad, sad    sadly ,sadly   sad ,sadly   sadly , sad  
sad, sad  sadly, sadly  sad, sadly    sadly, sad  
sad; sad    sadly; sadly    sad; sadly    sadly; sad  
Human beings are not aware of the importance of preserving endangered species.  Some endangered species have already reached the end of their life span in evolution.  The development of human society has greatly affected natural ecology systems.  The world’s climate has changed greatly that most species cannot survive.  
mix with  do well on  exist in  float on  
to which  in which  for which  on which  
in which   on which    to which    for which  
die of    die out    die from    die off  
governments should make some laws to protect endangered species.  People should pay more attention to the protection of natural surroundings.  Relevant law must be made and enforced with the support of the people  Some organizations should warn people not to trade in endangered animals.  
sad, sad    sadly, sadly    sad, sadly    sadly, sad  
for; dying away    about; dying down    of; dying out    on; dying off  
sad, sad    sadly, sadly    sad, sadly    sadly, sad  
hoped; haven’t    had hoped; haven’t    had hoped; didn’t    hoped; didn’t  
sad   sadly   sadness   sadnessly  

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