Question 1 with 1 blankjuan y yo damos una blusa a nuestra hermana gisela.
question 2 with 1 blankmi tía da a nosotros una mesa para la casa.
question 3 with 1 blankgisela da dos corbatas a su novio.
question 4 with 1 blanka mi mamá yo doy un par de guantes negros.

The correct object pronoun and verbal conjugation that fills the sentences are:

1. Juan y yo le damos una blusa a nuestra hermana Gisela.

2. Mi tía nos da una mesa para la casa.

3. Gisela le da dos corbatas a su novio.

4. A mi mamá yo le 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: me.

2. Tú: te.

3. Él/Ella/Ello: le/se.

4. Nosotros: nos.

How in the majority of the sentences the noun who was directed the action for was from the third person: Gisela, novio, mamá (he or she in English), the object pronoun most used was "le".

eso es

y ahora me estoy dando cuenta