Yo bailo, ellas bailan, ellos bailan
Yo escucho, ellas escuchan, ellos escuchan
Mi amigo me dio un libro nuevo. (Past)
The correct answer is:
Los amigos
Cantaba is the correct imperfect tense for the word in parentheses.
The translation is “After eating tamales my friends sang(cantaba) a lot” Cantar means to sing and cantaba means “sang”. Sang makes it past tense, so it makes more sense in the sentence as well.
Hopefully this helped :)