I know that you said 'opening line', but I found all of that information kind of hard to fit into a handful of sentences. As a result, what I've written might really differ from your perceptions of the story. I hope that it's not too different and that it works for you. Good luck.
number 1D.2A.3B.4A.5D.6C.7D.8A.9B.10B.11C.12D
Answer:
Simile: comparing a float aways down a stream to time
Metamorphosis: when it said the life, youth, wealth was renowned and the processes to what it was. that was the big change.