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The book is very difficult. ________ read something easier?

A．Why don’t                           B．Why not

C．Why you not                           D．Why not you

----_____ going hiking tomorrow, Sandy?

-----Good idea.

 ---Could you please sweep the floor?

---_____________. I have to do my homework.

—Don’t worry. Your uncle is coming to help you.

   —________he doesn’t come?

A. What if                    B. Why not                           C. What about            D. What for

----Thank you for hclping me with my homework.

-----           .

A. Sure               B.Why not          C.No problem D.No thanks