Answer:

Step-by-step explanation:
We are given the sentence:
Which translates to:
We want to fill in the blank with the correct form of estar.
We are conjugating for nosotros. The correct conjugation is estamos. (Estan is used for ellos/ellas/ustedes).
Therefore, the correct answer is estamos.
The sentence is:
- Nosotros esatmos en Cuba.
- We are in Cuba.