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0) box bus potato [day]
To make plural of box, bus and potato we need to add -es; to make the plural of day we add only -s.

1) wolf elf knife chief
2) man tooth spoon person
3) match tax cross house
4) volley fly today toy
5) radio potato tomato hero
6) actor doctor lawyer bride
7) brother-in-law passer-by by-stander bar of chocolate
8) princess niece widower heroine