Answer:
The sentence that we must complete is:
Un primo mío. Todo el mundo dice que (6) me parece mucho. Podríamos ser hermanos.
This can be translated to:
"A cousin of mine. Everybody says that he seems a lot to ___. We could be brothers"
Now, the word that completes the blank is "se"
"Todo el mundo dice que se me parece mucho"
Its letter A (estes) its talking abt present time
Hola familia, fui al mercado la semana pasada, nunca creerás las cosas que compré. Tendrás que ir algún día. Tendré que preguntarte si te aseguras de traer suficiente dinero. Compré comida, así como algunos artículos al azar, pero cuando me preguntó de qué sabor le dije que tendré amarillo en lugar de mantequilla. Es una historia bastante divertida, en mi opinión, bueno, tengo que irme ahora. ¡Adiós!
in english it roughly translates to:
Hello family, I went to the market last week, you'll never believe the things I bought. You'll have to go one day. I will have to ask if you do go make sure you bring enough money. I bought food, as well as a few random items, but when he asked what flavour I said I'll have yellow instead of I'll have butter. Quite a funny story, in my opinion, well I have to go now. Bye!