21．A：Can I go out     a story immediately?  B：Of course，you can．
          A．to        B．on        C．by     D．in
22．If burns are on arms or legs，keep them    than the heart．
      A．warmer        B．stronger        C．lower     D．higher
23．A：How did Li Lei do in the exam this time?
    B：Well, his mother seems       with his results．
    A．pleasing        B．please        C．pleased     D．to please