Quien dos lenguas vale por (is worth) dos.

The sentence that we must complete is:

"Quien dos lenguas vale por dos."

A rough translation of this is:

"Who   two languajes, is worth for two"

The word that can complete the sentence is "speak" or "habla" in Spanish, the complete sentence is:

Quien habla dos lenguas vale por dos.

this question is given using the conditional form. conditional tenses are is used when talking about hypothetical situations and probabilities. also, this is used when making polite requests. so comprarías is the conjugation of the verb comprar that matches the second person singular in the conditional. finally:

¿cuál comprarías tú?

i got it here  

fill in the blank with the correct answer. carlos and sofia and from toa baja to travel west along the coast.