—Is this notebook?—No it isnt.A. theirs; theirB. hers; hisC. your; mineD. your; my

问题补充：

—Is this notebook?

—No, it isn .

A. theirs; their

B. hers; his

C. your; mine

D. your; my

答案：

A. theirs; their

B. hers; his

(答案→)C. your; mine

D. your; my

解析：物主代词的用法。名词性的物主代词单独使用，后不用再加名词；形容词性的物主代词需用于名词前，句中第一空格后有名词notebook，故用形容词性的物主代词，第二空后无名词，故用名词性性物主代词。