Question

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1. ¿dónde nos _?

encontramos
recogerme

1. ¿cuánto cuesta la _?

entrada
ocasión

Explanation:

For question 3, "encontramos" is the correct verb form in the first - person plural (nos) and makes sense in the context of "Where do we meet?". "Recogerme" is a reflexive verb in the first - person singular and does not fit the subject "nos".
For question 4, "entrada" means "entrance" or "admission", and it is logical to ask about the cost of the entrance. "Ocasión" means "occasion" and does not fit the context of asking about a cost.

Answer:

1. encontramos
2. entrada