Answer: The form of "ser" that completes the sentence provided is "es".
Explanation: The sentence provided can be translated as "Javier ____ student". Therefore,<u> as the sentence is referring to a permanent state, the verb that fills in the blank is "ser".</u> At the same time,<u> "ser" needs to be conjugated into the third person singular because the subject is "Javier", </u>which can be replaced with the third person pronoun "he". <u>The third person singular of the verb "ser" is "es"</u>. Therefore, the form of "ser" that fills in the blank is "es".
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Answer:
—¿Quién toma fotos?
—Margarita <u>las</u> toma.
—David, ¿estás usando la computadora?
—No, ahora no. <u>V</u><u>oy</u><u> </u><u>a</u><u> </u><u>usarla</u> más tarde (later on).
—Quiero ver el hotel donde vamos a quedarnos (stay).
—Lo siento, no <u>lo</u><u> </u><u>puedes</u><u> </u><u>ver</u> ahora.
—¿Nos entienden ustedes?
—Sí, <u>los</u><u> </u>entendemos.
—¿Dónde está Ana leyendo el libro?
—<u>E</u><u>stá leyéndolo</u> al lado de la piscina.