Answer:
The correct object pronoun and verbal conjugation that fills the sentences are:
1. Juan y yo <u>le</u> damos una blusa a nuestra hermana Gisela.
2. Mi tía <u>nos</u> da una mesa para la casa.
3. Gisela <u>le</u> da dos corbatas a su novio.
4. A mi mamá yo <u>le</u> doy un par de guantes negros.
Explanation:
The object pronouns are words that, depending on the sentence, can be used for replacing a pronoun, in Spanish, respect their noun that goes directed, could be:
1. Yo: <u>me</u>.
2. Tú: <u>te</u>.
3. Él/Ella/Ello: <u>le/se</u>.
4. Nosotros: <u>nos</u>.
How <em>in the majority of the sentences the noun who was directed the action for was from the third person</em>: Gisela, novio, mamá (he or she in English), the object pronoun most used was "le".
Nina: ¿Dónde está Alejandra? Carlos: Alejandra es de Costa Rica.