in this paragraph, in the last sentence he says "my favorite, sharks!" but also he also states that he wanted to learn about polar bears and the north pole so most likely mammals would be your answer
Here, You can use few verbs to complete the sentence in an appropriate way: <span> Yo veo los pepinillos. </span><span>Yo ví los pepinillos. </span><span>Yo veré los pepinillos. </span> Hope this helps!