1.(...) toys are in the box
варианты: Kate's, Kates', Kate
2. you can play with (...) balls
варианты: this, these, that
3. Where does the (...)mother work?
варианты" children, children's, childrens'
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4. (...) does he often go to the swimming pool?
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5. (...) John's brother hungry?
6. (...) Mrs Brown's sons work hard?