Answer:
It is an active voice
Explanation:
If it was passive the sentence would be "The Pizza was eaten by us", Hope this helps :)
i dont think there is any reason. you might find that the author has the same themes that he/she likes to write about but idk i think you need to read the book
repetition can help a lot it can help you memorize things take me for example i had to get the song lullaby down so every day i sung it so that is what repetition can do