What does how are you doing in spanish means

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?

Which store would you visit to buy bananas? a. el quiosco b. la farmacia c. la frutería d. el supermercado

Which verb form correctly completes this sentence? me gusta leer el género narrativo, por eso prefiero que los libros novelas policiales. a. seas b. sean c. seamos d. sea