Umm what sentence? what word?
The answer to your question is D.
Yellowstone was supposed to erupt around 2,000 years ago from what i know, which makes it loooong overdue.
Well what were your words from exercise 2...?
Answer:
The author's main purpose/idea is trying to persuade you to think shorter summer breaks are better.
Explanation:
So, basically, shorter summer breaks are better.