Answer:
In order to complete this exercise, you have to choose the correct form of the demonstrative pronouns provided for each sentence. <em>In order to choose the correct form of each relative pronoun, you will have to pay particular attention to the gender and number of the noun to which the relative pronoun makes reference.</em>
Explanation:
los estudiantes / este
<em>Los estudiantes estos</em>
los países / aquel
<em>Los países aquellos</em>
la ventana / ese
<em>La ventana esa</em>
los periodistas / ese
<em>Los periodistas esos</em>
el chico / aquel
<em>El chico aquel</em>
las sandalias / este
<em>Las sandalias estas</em>
las chicas / aquel
<em>Las chicas aquellas</em>
