boy's leg
girl's key
cat's tail
father's friend
boy's toys
这个题目没有s'的项目
应该是：
the boy's leg
the girl's key
the cat's tail
the father's friend
the boy's toys
1.the leg of the boy ___the boy's leg
2.the key of the girl___the girl's key
3.the tail of the cat___the cat's tail
4.the friend of my father____my father's friend
5.the toys of the boy ______the boy's toys
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