retain vt. 保持，保留; endure v. 忍受; maintain vt. 维持，保持，坚持认为;

　　survive vi. 生存; vt. 活过 (宾语为某种灾难)。 survive a flood 活过一场洪水。

　　前缀sur表示过 ，外，超; vive 表示生活，强调活着。

　　54. They usually have less money at the end of the month than _C_ at the beginning.

　　A which is B which was C they have D it is

　　less than句子前后要平衡结构。

　　55. In the course of a day students do far more than just _A_ classes.

　　A attend B attended C to attend D attending

　　far more than 远远多于，远不止于;也要句子前后平衡结构。

　　56. The French pianist who had been praised very highly _C_ to be a great disappointment.

　　A turned up B turned in C turned out D turned down

　　turn up 后面不加宾语表示出现，后面加宾语表示将声音调高，调大;

　　turn in + 宾语 上缴，交出; turn down 将声音调低，调小;拒绝;

　　refuse sb. 指直接的回绝; turn sb. down 则指委婉的拒绝;

　　turn out + 动词不定式 最终证明是，结果是。

　　57. Many difficulties have _B_ as a result of the change over to a new type of fuel.

　　A risen B arisen C raised D arrived

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