He couldn’t have finished the task on his own last night,（）?

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• After you have finished your dinner, place your napkin on the table to the _of your plate. ( )
• When I finished grammar school I had to go to work because my mother could no longer feed and （）me on her cooking job.
• We are supposed to （）all the books when we are finished with them.
• （）, products are bought as raw materials and sold as finished goods.
• When you have finished eating, refold your napkin to the way it was before and put it next to your plate.