Is this sentence a phrase or clause, until the popcorn finishes popping

ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

1) correct answer: general clinton hoped that general burgoyne could him.

2. correct answer: “when they heard box 342 rung, however, they assumed the fire was out of their territory and unhitched the horses. only two fire companies were not fooled by the misleading alarm.”

3.) correct answer: generals were able to send secret messages to each other using a mask.