Which word best completes this sentence? raúl el bolígrafo para escribir.

Translating the sentence, we get something along the lines of Raul the pen to write. There's one word we can see falls into the blank, and that's used. Now all wee need to do is translate used into Spanish. One way to say used in Spanish is usado, so usado is the word that best completes the sentence. 

Raul és el boligrafo para escrivir

Me gusta (escribir) en mi cuaderno.

Beef is the most common meat in bolivia; however,  chicken is easily found, as is pork.