"Then he caught up with the group, determined not to lag behind, not to complain, not to be any trouble to anyone." Why is there a comma after "group"?

In what way do you think it would be difficult to live next to the united states

If an item does not contain a fragment, write correct. if the item contains a fragment, rewrite it to make it one or more complete sentences. 1.)their faces shining with delight at seeing the movie star. 2.)i wanted one thing. to take a long nap 3.)the committee was irrupted by this application. which we received just yesterday. 4.)i enjoy working with my hands. 5.)traffic lights flashing erratically as the cars jammed in the intersection, unsure whose turn it was to proceed. 6.)the apples cooked. with their sweet juices bubbling away. 7.)just as mr. chao said goodbye. 8.)classified ads filled the pages of the newspaper. 9.)a report to write and math to do before tomorrow. 10.)the silhouettes of the trees against the light of the moon.

Which three lines in this expert from anita desai’s games of twilight clearly show an omniscient narrator