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for; to to; of for; of to; to
decisions advantages sides measures
tend tending tended being tended
do；being polluted get；polluted take；being polluted have；polluted
could take must take should take would take
methods; to destroy methods; from destroying measures; from destroying measures; to destroy
are dying out have died out died out die out
now that as long as unless before
will take should take would take took
take had taken took have taken
before as long as now that unless
take measures do some work do something make some rules
accomplish conflict construct contact
should take must be taken would take be taken
take must take are to take took
Our living space on the earth is getting smaller and smaller Our living space should be measured in cubic volume We need to take some measures to protect space We must create better living conditions for both birds and animals
take;means made;measures took;measures do;actions
polluting being polluted polluted pollute
take must take are to take took
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