Que traigas a la fiesta?
Yo traigo un pastel y también traigo regalos.
<u>Spanish to English Translation:</u>
<em>Marcos es el primer gerente de su familia. ⇒ Marcos is the first manager of his family.</em>
The answer is between tú or ustedes I think more tú
You could fill it in with a lot of different words depending on the region, but I would personally go with either quisquilloso or exigente. Both mean picky eaters in this situation.