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______ work has been done to improve people' s living standard.

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was doing    would do    had done    would have done  
had already been done    has already been done    would be done    have already been done  
taking    taken    has been taken    being taken  
that required him  which was required of him  what was required of him  what has been required him  
had been done  has been done  was done  is being done  
will have been done  was done  had been done  has done  
with what      that that    by that      that what  
had been done  done  having done  to be done  
had been done   done   having done   to be done  
Many  A great many  A great deal of  A large number of  
was to be done    will do    is to be done    are done  
has done   has been done   have done   were done  
had done    would do    was doing    would have done  
has done so much    has been done so much    so much has been done     has so much been done  
A.mass of   A.plenty of   A.number of   A.great many  
it is    it has    it will be    it has been  

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