Mice. One mouse is a mouse. Mice is more than one. The lady had
mice in her house. The cat caught a mouse.
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Eek a Mouse, Mouse in the House!
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Topolina is an Italian equivalent of 'lady mouse'. It's a feminine gender noun that takes as its definite article 'la' ['the'], and as its indefinite article 'una' ['a, one']. It's pronounced 'toh-poh-LEE-nah'.