根据对话内容，选择恰当的句子补全下列对话。
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Miss Wu : Can I help you?
Li Gang : Yes, I'd like to return this book, please.
Miss Wu : 71.
Li Gang : No, I couldn't read it. I had a hard time reading a few pages, and then I decided to give up.
Miss Wu : 72.
Li Gang : It wasn't the language. It was the words. They are too small for me.
Miss Wu : 73.What can I do for you then?
Li Gang : Well, I'd be glad if you could find me another book.
Miss Wu : 74.
Li Gang : Yes, but one with bigger words.
Miss Wu : 75.
Li Gang : Oh, Oliver Twist. This one is fine. And the words are much bigger. Thank you very much.
Miss Wu : You're welcome.