Answer:
The correct way to complete the sentences are as follows:
1. Marcela found the sandals under the bed.
2. Gustavo received a very nice gift.
3. Sara and Viviana finished the book at the same time.
4. The travel agent prepared a very interesting itinerary.
5. I am going to visit the city in winter.
6. Dependents listen to the game on the radio.
Explanation:
1. el 2. las 3. un 4. una
