24．A．that               B．if                 C．how              D．why

23．A．He                  B．She               C．It                 D．They

22．A．amazing            B．interesting        C．beautiful         D．boring

21．A．sent               B．had               C．sold               D．received

20．A．inventions           B．reasons               C．mistakes           D．changes

19．A．lent                B．bought                  C．returned            D．showed

18．A．ideas               B．skills               C．names           D．facts