In this exercise, you have to write the verb in the correct form of the preterite tense to complete the sentence.
You use <u>the Spanish preterite tense</u> ("pretérito perfecto simple" in Spanish) when you want to talk about actions completed at some point in the past.
The <u>translation</u> of the sentence is: Juan saw fireworks.
Well from personal family experience it took my aunts aunt 4 days on a bus from Mexico to California but that all depends on where they are coming from and where they are going