24．When I arrived I saw the place was already ______ by two strangers in uniforms.

A．occupied 　　　　　　 B．conquered 　　　　　 C．possessed　　　　　　 D．owned

23．It is difficult to ______ a conversation with someone who only says “yes” and “no”.

A．keep on　　　　　　　 B．keep down　　　　　　 C．keep up　　　　　　　　 D．keep in　　

22．Polar explorers have to be extremely _______ to bear the climate and other hardships.

A．difficult　　　　　　　 B．rough　　　　　　　　　 C．tough　　　　　　　　　 D．brave

第一节：多项选择(共10小题；每小题1分，满分10分)

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。

21．The new chairman was quite familiar with the ________ for conducting a meeting.

A．procedure　　　　　　 B．problem　　　　　　　　 C．question　　　　　　　　 D．people