Final answer:
The sentences that use the appropriate direct object pronouns are: 'No la entiende.', 'La confirma.', 'Están haciéndolo.', and 'Tienes que conseguirlos.'
Step-by-step explanation:
The sentence that uses the appropriate direct object pronoun is: No la entiende. In this sentence, the direct object pronoun 'la' is used to replace the noun 'una empleada' (an employee). The pronoun 'la' agrees with the feminine gender of the noun.
Similarly, in the sentence 'El agente confirma la reservación.', the appropriate direct object pronoun is 'la' because it refers to the feminine noun 'la reservación' (the reservation). Therefore, the correct sentence is 'La confirma.'
In the sentence 'Están haciendo un viaje de tres semanas.', the appropriate direct object pronoun is 'lo' because it refers to the masculine singular noun 'un viaje' (a trip). Therefore, the correct sentence is 'Están haciéndolo.'
Lastly, in the sentence 'Tú tienes que conseguir los pasajes de avión.', the appropriate direct object pronoun is 'los' because it refers to the masculine plural noun 'los pasajes' (the tickets). Therefore, the correct sentence is 'Tienes que conseguirlos.'
Learn more about Spanish Grammar