Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
IfwehadreceivedyourL/C,we______shipment.
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
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Iwouldlove________tothepartylastnightbutIhadtoworkextrahourstofinishareport.