21. I wonder what it feels like to be one of       really rich, The Browns already have two Rolls Royce and now they are buying        third.

    A. the; a                       B. the; the

    C. /; a                          D./; the

22.—There are a dozen pens in this house, but I can hardly find one now.

   —Keep looking.         is sure to turn up.

    A. One           B. It                C. That             D. This