The sentence that contains an unnecessary shift in verb tense is the second one - Lee noticed a problem and alerts a teacher.
It should be <em>alerted, </em>which is the past tense as the first verb <em>noticed.</em>
I think the answer is vigilant because it talks about how they have their hooves planted firmly on the ground with their heads high.
I’m pretty sure it’s a metaphor!
the poet refers to the 'wealth' of happiness and gaiety.
