填入正确的代词形式。These are your books, Kate. Put ___ in the desk, please. (they)
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____ must look after ____ things. (you)
-Are these ____ (you) pencils?-Yes, they are ____(our).
____(I)dog is white. But ____ (she) is black.
Trees are planted in ___ (we) country every year, which makes our country more and more beautiful.
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