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We must do something to save the wild animals. Something must         to save the wild animals.

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nobody    nothing    somebody    something  
we can save   can we save   we must save   must we save  
must is done    must be done    must do    must done  
should do    must do   must have done    ought to have done  
dangerous    a danger    in danger    dangerous one  
in fact  on holiday  on time  in danger  
Yes, we can    No, we can’t    Yes, we must    No, we needn’t  
take measures    do some work    do something    make some rules  
can do    must do    has to do    must be done  
must is done    must be done    must do    must done  
ought to have done    must do   must have done    had to do  
must    would    should    shall  
so    and    but    though  

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