题目内容

单数变复数。
policeman →                      
tooth →                        
watch →                         
dress →                        
boy →                     
woman →                       
box →                           
toothbrush →                      
chair →                        
couch →                                                                         
policemen, women, teeth, boxes, watches,    
toothbrushes, dresses, chairs, boys, couches
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