F: Can I help you? ,M: Yes, I bought this book here yesterday, but when I took it to school I noticed this page was missing.
(A) F: Sorry, We didn't find your wallet in our bookstore. (B) F: Excuse me, could you repeat the question? (C) F: Have you found your homework? You must submit it to me this noon. (D) F: Can I borrow your reference book to finish my homework?
B