1. The article starts with "the cutest" and goes deep into it layer by layer. Finally, it points out that summer is an upward stage of the whole universe, at which people's body and mind are freed from heavy bondage. Expressing an unrestrained natural state of mind is "the heart of summer" (I think the answer to "the water fades away" is too long)
2. No, "strange rise" and "barren" take care of each other, and "fresh" and "gentle and charming" take care of each other, which is inconsistent after the exchange
3. Use personification rhetoric to express accurately and vividly. I think this answer is very good, so I won't scribble, hehe.