Plzz answer this correctly

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!

Isaw him _ .(a)danced (b)dance (c)dancing

Explain the effect of the juxtaposition of the following lines that serve as a beginniing to the new section that begins on page nine: anguish. german soldiers-with their steel helmets and their deaths-head emblem. still, our first impressions of the germans were rather reassuring.