SP:
Margarita es muy vieja, pero su prima es muy joven
EN:
Margarita is so old but her cousin is so young
<em>thats my guess, hope it helps!</em>
Fácil- fáciles
Difícil- difíciles
The other are ok
B me ducho is the correct answer
The direct object pronoun would be "la" because la gasolina is feminine. In a sentence you could say
La compro en la estacion de servicio.
Direct object pronouns are placed before the verb generally.
It is most likely B) el ensayo. A practice before a peformance.