Answer: I believe I can help you with this exercise, but I am missing a word for Question 1:
1. Costa Rica es el país de Centroamérica con la población más ________.
2. La moneda que se usa en Costa Rica es el COLÓN COSTARICENSE.
3. Costa Rica no tiene ejécito; COMO RESULTADO, puede invertir más dinero en la educación y las artes.
4. En el siglo XIX los costarricenses empezaron a exportar su café a INGLATERRA.
5. Hoy día más de 50.000 costarricenses trabajan EN (EL) CULTIVO DEL CAFÉ.
6. El edificio del Museo Nacional de Costa Rica es el antiguo CUARTEL.
Explanation: Just to elaborate a little bit on the answer, it can be added that in this passage about Costa Rica, you have been asked to choose the correct word to fill the gap. The passage provides some facts about the country, such as its currency, its lack of an army (since 1948), the building of its National Museum, its trade with England, its coffee, and its people—although I cannot help you on that one, since you have not been provided with a word.