One beat does not necessarily mean it is one foot. I would say false.
Rhythm, because for words, without rhythm, there would be no proper emphasizing on syllables so we would not be able to understand each other. :)
longing for the woman he is describing
i hope this helps :)
Maybe put it in parenthesis or maybe wait until the next paragraph. I'm not sure it all depends on your teacher.
Sample response: The general lesson from the reading is that inventing a useful product takes time and perseverance. You have to experiment, fail, and retry your ideas until you succeed.