Este semestre no tengo dinero para alquilar un apartamento. (1) lo que (que/lo que) necesito es alquilar una habitación. ¿cuánto
s dormitorios tiene tu apartamento? —el apartamento (2) que (que/lo que) tengo tiene dos, pero el otro ya está alquilado. aunque (although) ayer conocí a un chico (3) que (que/quienes) alquila una habitación cerca de la universidad. —¿verdad? y ese chico a (4) quien (que/quien) conociste, ¿cómo se llama?
Explanation: Just to elaborate a little on the answer, it can be added that in this exercise they are asking you to complete the sentence with the appropriate pronoun. The grammatical structure <em>lo que</em> can be literally translated as "that which," and <em>que</em> can be translated as "that." <em>Quien</em> and <em>quienes</em> can be translated as "who," in singular and plural form, respectively. So, in sentence 1, you need to use the structure <em>lo que</em>, since what the speaker is saying is "<em>What </em>I need is to rent a room." Alternatively, in sentence 2 you just need to use <em>que</em>, since what the speaker is saying is "The apartment <em>that</em> I have has two (bedrooms)."