There could be many answers.
For example:
Tomaron
Robaron
Tocaron
But I think the right answer would be....
Ayer, Roberto y Carlos gastaron 12.000 pesos.
Zarigüeya
Some people call it “pasa” but it’s zarigüeya
For verbs present tense ending in -ar, the conjugations are o, as, a, amos, an
For -er endings, o, es, e, emos, en
For -ir, o, es, e, imos, en
