Which sentence in “Treatment of American Indians” does NOT support the opening idea and should be omitted (taken out)?

In the last letter chris sent to westerberg, he wrote, "this is the last time you shall hear from me," and "if the adventure proves fatal and you don't ever hear from me again . . " do you think chris was suicidal, had a premonition of what might happen, or simply was acknowledging the inherent risks of living in the wilderness? support your opinion with evidence from the book.

It was extremely base of him to desert you in your time of need. ( change into exclamatory sentence)

Pls needs hypehen or no hyphen 1. after serving as principal for ten years,mr. jones will resign this year 2. it's sixty seven degrees outside and it's only february!