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:
25. C
26. D
27. C
28. D
29. C
30. D
When you're talking about nonspecific things.
it's like (a) and (an) in english.
uno is for singular masculine.
una is for singular feminine.
unos is for plural masculine.
unas is for plural feminine.