21£®Frank studied        Chinese language in Beijing for four years, so he gets       good knowledge of Beijing£®

    A£®a; the                  B£®£¯;£¯                  C£®/; a    D£®the ;a

22£®£­Why didn't you go to Mike's birthday party yesterday?

£­Well, I          , but I forgot it£®

       A£®should               B£®would              C£®should have         D£®must have