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Su Hai: Whose shirt is this?
Liu Tao: It's Mr Green's.
Su Hai: Whose trousers are these?
Liu Tao: They are Tim's.
Helen: I'm thirsty. Can I have some milk?
Dad: Here is some milk. 
Helen: Are you thirsty too, Dad?
Dad: No, but I'm hungry.
Helen: Here's a hamburger.
Dad: Thank you, Helen.
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