【典例精析】1.（2008安徽，23）Fred entered without knocking and, very out of breath, sank _______ a chair.

A. on                B. off             C. into                  D. to

【解析】C 考查介词的用法。句意为：Fred没有敲门就闯进来了，然后气喘吁吁地坐到椅子上。Sink into (a chair) 表示“沉下、沉落、陷入”。

2.（2008北京，33）If you really have to leave during the meeting, you’d better leave ____ the back door.

A. for            B. by          C. across          D. out

【解析】B考查介词。for为了；by借助，通过；across通过（平面）；out出去。根据句意：如果你必须在会议期间离开，你最好从后门出去。

3.（2008福建，23）A great man shows his greatness ________ the way he treats little men.

A. under         B. with         C. on              D. by

【解析】D考查介词的用法。by (表示方式)通过; 凭借。句意为：一位伟人通过他对待普通人的方式来展示出他的伟大。

4.（2008湖北，30）30. When she first arrived in China, she wondered what the future might have_________for her, but now all her worries are gone. （2008·湖北）

A. in need       B. in time       C. in preparation    D. in store