Choose the best answer. (yours, mine, hers, his, theirs, its填空，每词限用一次)
1．—Mum, I can’t find my jacket. Did you see it? —Is this jacket ________?
2．I have a nice pencil-sharpener. It’s ________.
3．Alice has a pet dog. The pet dog is ________.
4．There are many skirts over there. They’re the girls’. They’re ________.
5．—Is this big football Ben’s? —No, it’s not his. ________ ball is small.
6．The mouse has a tail. And ________ tail is very long.
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