Does anyone know the answer to this question?

Which sentence contains a completed action? when i was a child there was a fair in my town every year. i won a prize at the fair last year.

Actividad 3 el dia de la boda 1. la novia un poco (preocupar) por su vestido. 2. las puertas de la iglesia (abrir). etc,

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?