I believe it's Voy, because that is the "I" or "Yo" form of the word "ir", meaning "to go".
Where are you going to eat?
(I am going to) The restaurant.
¿Adónde vas para comer?
Voy al restaurante.
Answer: Necesito preguntar en español completando las letras que faltan.
That is how you say it in Spanish if you need anything else please send me a message.
