Trabaja en el jardin because first of all it has the correct tense for the sentence and it is one of the choices that actually uses el for the conjugation
The correct pronoun is "El" because he is a boy and he is your cousin so you have to use "El"
That is correct my friend. Hope it helped.
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Graba tus respuestas. No corras rápido. No camines despacio. No cantes No comas mi comida No hablar ingles en clase