This could be answered, theoretically, in many different ways. All of which might sound a bit dirty. The translation of the sentence is: "What ___ ___ (to) do to Juan on vacation?" I could fill in the blanks with "tú quieres" which would translate the sentence to "What do you want to do to Juan on vacation?" Without choices, that is the best I got.
b. cayo
El nino cayo del segundo piso = The boy fell from the second floor
Hope this helps
¡ hola !
para servir sopa necessitas
un (el) tazón <em>(bowl)</em>
<em>el</em> <em>cuchillo = knife</em>
<em>el tenedor = fork</em>
<em>el vaso = glass</em>