丹尼尔和汤姆找到了李老师推荐的那本书。它到底符不符合丹尼尔的要求呢？最后他们买了吗？

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Tom: Have you found the book recommended by Mrs. Li?

Daniel: 30 Nights on Nightmares? No.

Tom: Mrs. Li said it was a good self-help book aiming at those who want to refresh their understanding of basic math.

Daniel: Not conductive to homework or exams?

Tom: She didn't mention that.

Daniel: I am looking for some books that have keys to our after-class exercises. What's our homework today, anyway?

Tom: Re-read Chapter 13 and summarize the main content in a diagmp3, and finish the exercises in Chapter 13.

Daniel: I don't understand why we must read it again. I understood everything in class.

Tom: Mrs. Li says this second reading will help you consolidate what you've learned in class. That's why we must do homework.

Daniel: But I can't do my homework without answer keys!

Tom: I think maybe 30 Nights on Math is not bad. Look, it has explanations on every fomp3ula in our text book.

Daniel: Oh, that's good! I have problems with fomp3ulas. I will get this book.

Tom: I have little money left. I believe I have seen some pirated versions of this book. They are much cheaper.

Daniel: Don't buy the pirated books. There are many mistakes in spelling. What's more, it's just against law to buy them.

Tom: It's against law? Oh, I didn't know it was that serious! But I don't have enough money for that book.

Daniel: You can sell your Harry Potter to me for cash.