Sub-questions are narrower questions. They are important because they provide the 'skeleton' around which you will find information to answer your main research question.
Answer:
I believe that would be 3.
8 - Subject: I | Verb: Learned
9 - Subject: I | Verb: Like | Adverb: Usually
10 - Subject: You | Verb: Pick (up)
I believe that this is Personification because she's giving nonliving traits human characteristics.
Answer:
It is a pun.
Explanation:
This is because it is a figure of speech that exploits a word's meaning in this case that the book was impossible to put down.