Answer:
The correct sentences with the verbs are:
1. <u>Se comió</u> muy bien en Las Delicias.
2. <u>Se vendieron</u> muchas camisetas allí.
3. <u>Se sirvieron</u> platos exquisitos cada noche.
Explanation:
The verbs in Preterite Form, when the sentence has the object pronoun <em>"se"</em>, are conjugated in the next form, depending on that if it is singular or plural respectively:
1. <em>Se comió/se comieron. </em>
2.<em> </em><em>Se vendió/se vendieron. </em>
3. <em>Se sirvió/se sirvieron.
</em>
For identify which form you could use (singular or plural) you must see the next substantive there are <em>"platos"</em> or <em>"camisetas"</em> are plurals, that's the reason why was selected that form.