To fill in the blanks appropriately, the best option would be:
6. A menudo hay que hablar Inglés y Español en Miami, Florida.
- "A menudo" means "often," which fits well in the context.
- "Hay que" translates to "one must," indicating necessity.
- "Hablar" means "to speak," which is preferable in this usage compared to "decir," which means "to say" and would not fit the context as well.
So the complete sentence would be: "A menudo hay que hablar Inglés y Español en Miami, Florida."