.(   ) 1.Tom knows a lot _______ Deng Yaping

  A   at    B   in   C   about   D   for

.(   ) 2.  -----_____ is your letter from?

         ------ Sorry, but I don’t know.

  A  whose  B    where  C   who   D  how

.(   )3.—Could I study English ____ you?

 —No problem.

A. in                  B. for                    C. with                  D. about