Answer:
ayer
el mes pasado
Step-by-step explanation:
The sentence "Fui de compras" means I went shopping and as it is in the past, the phrases that match this tense are:
"ayer" that means yesterday and "el mes pasado" that means last month.
The other options are not correct because "hoy" means today and "en este momento" means in this moment and they are in present tense. Also, "mañana" is tomorrow and "el mes que viene" means next month and they are in future tense.