49．A．learn            B．study C．pass          D．think

  48．A．computer     B．science     C．math D．music

  47．A．read             B．see           C．pass on     D．1isten to

  46．A．shortly        B．easily       C．loudly      D．badly

  45．A．best            B．beautiful   C．worst D．nice

  44．A．First of all    B．And C．However   D．But