In each of the cases, the answers were chosen due to the following explanation:
<em>"El niño"</em> is a noun that could be replaced by the personal pronoun "él," and the right conjugation of the verb <em>"escoger"</em> in the Preterite Form for that noun is <u><em>"escogió."
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The personal pronoun used in the sentence is <em>"yo,"</em> and the right conjugation of the verb <em>"anunciar"</em> in Preterite Form for that noun is <u><em>"anuncié."
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The conjugations of the verb <em>"vender"</em> in Preterite Form taking into accoun the personal pronouns are:
<em>Yo </em><em>vendí.
</em>
<em>Tú </em><em><u>vendiste</u></em><em>.
</em>
<em>Usted </em><em>vendió.
</em>
<em>Él </em><em>vendió.
</em>
<em>Ella </em><em>vendió.
</em>
<em>Ello </em><em>vendió.
</em>
<em>Nosotros/Nosotras </em><em>vendimos.
</em>
<em>Ustedes </em><em>vendieron.
</em>
<em>Ellos/Ellas </em><em>vendieron.
</em>
How the personal pronoun used in the sentence is <em>"tú,"</em> the right conjugation is <u><em>"vendiste."
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