the postcard is (mine) 对括号内提问 __ __ the postcard?the boy on the black bike is (my) cousin 对括号提问 __ __ is the boy on the black bike?the books on the shelf are (one of my friends') 对括号提问 __ __ the books on the shelf?

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thepostcardis(mine)对括号内提问____thepostcard?theboyontheblackbikeis(my)cousin对括号提问____istheboyontheblack

the postcard is (mine) 对括号内提问 __ __ the postcard?the boy on the black bike is (my) cousin 对括号提问 __ __ is the boy on the black bike?the books on the shelf are (one of my friends') 对括号提问 __ __ the books on the shelf?
the postcard is (mine) 对括号内提问 __ __ the postcard?
the boy on the black bike is (my) cousin 对括号提问 __ __ is the boy on the black bike?
the books on the shelf are (one of my friends') 对括号提问 __ __ the books on the shelf?

the postcard is (mine) 对括号内提问 __ __ the postcard?the boy on the black bike is (my) cousin 对括号提问 __ __ is the boy on the black bike?the books on the shelf are (one of my friends') 对括号提问 __ __ the books on the shelf?
1 Whose is
2 Whose cousin
3 Whose are