Something there is that doesn't love a wall,
that sends the frozen-ground-swell under it,
and spills the upper boulders in the sun;
and makes gaps even two can pass abreast.
the work of hunters is another thing:
i have come after them and made repair
where they have left not one stone on a stone,
but they would have the rabbit out of hiding,
to the yelping dogs. the gaps i mean,
no one has seen them made or heard them made,
but at spring mending-time we find them there.

whom does the speaker blame for the gaps in the wall?
himself
his neighbor
nature and hunters
rabbits and dogs

i decided to stay late in the laboratory to continue my experiment with the lightbulb. at midnight, thomas edison opened the door and saw all the stuff he was working on. the lightbulb, film and the transmitter. as he walks in an idea hits him on how the lightbulb would work. he would have to change a few wires around to get it to light up. when he did change the wires around it worked so he decided to write a telegraph to his friend to tell him about his success.   as he was packing up he grabbed the telegraph and walked to his home. he told his wife about the success and the next morning mailed the telegraph.

the answer is:

to persuade readers that a conquering prince must destroy a former republic if he hopes to hold it.

in the excerpt from "the prince," the author niccolò machiavelli suggests that to take possession of a city and endure the control over it, it is necessary to destroy it first. otherwise, people who have known freedom will eventually turn against the new rulers and fight back to recover their power.