將下列單詞按要求歸類。
father, seven, clock, copybook, sister ,watch,
stapler, one, grandmother, camera, four, knife
1. 家庭成員:                        
2. 數(shù)字:                      
3. 學習用品:                        
4. 日用品:_              ___
1. father, sister, gldndmother
2. seven, one, four 
3. copybook, stapler, knife  
4. clock, watch, camera
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