What subject pronoun would you use when talking to your aunt?

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?

Choose the best spanish word to correctly complete the sentence. siete veintiocho treinta doce cien cincuenta y dos treinta y un dias en el mes de febrero anos en un siglo (century) semanas en un ano dias en una semana meses en un ano dias en el mes de abril dias en el mes de diciembre

Which phrase best completes this sentence? en los almacenes están al aire libre. a. el supermercado b. el mall c. la feria artesanal d. la librería