Fill in the blank (3): en español, "to pick up" el auricular es cuando estoy en la calle, uso el . yo termino la conversación y auricular.

En español, "to pick up" el auricular es recoger el auricular. 

Cuando estoy en la calle, uso el telefono celular.

Yo termino la conversacion y uso el auricular.

For the first sentence, the correct answer is "contestar". Because, in Spanish when someone picks up the phone, the verb that describes the action is "contestar". The word "auricular" is referring to a ringing cellphone, so in that case, somebody would answer (contestar) that call. Note that the word "auricular" is in disuse in Spanish by young people, for they wouldn't refer to cellphones by the name "auricular" anymore.For the second sentence, the correct answer is "teléfono". Because the complete word of the cellphone in Spanish is "teléfono celular", in contrast with wired phone that was in home or in public place but you couldn't take it everywhere. For the third sentence, the correct answer is "cuelgo". Because when a conversation is over by cellphone in English you say: "Hang up the phone" as they do in Spanish by using the same verb "colgar". Now, as the noun is the first person singular, then the conjugation of the verb "colgar" has to be also like that, and therefore the correct answer is "cuelgo".

Talk to him translates to "hablale a el" which is a command so there you go