One of the most important non-legislative functions of the U.S Congress is the power to investigate. The power is usually delegated to committees—either standing committees, special committees set for a specific purpose, or joint committees __1__ consisted of members of both houses. Investigations __2__ are held to gather information on the need for future legislation,to test the effectiveness of laws already passed,to inquire into the qualifications and performance of members and officials of the other branches, and in rare occasions, __3__ to lay the groundwork for impeachment proceedings. Frequently,committees rely outside experts to assist in conducting __4__ investigative hearings and to make out detailed studies of issues. __5__

　　There are important corollaries to the investigative power. One is the power to publicize investigations and its results. Most __6__ committee hearings are open to public and are reported widely __7__ in the mass media. Congressional investigations nevertheless __8__ represent one important tool available to lawmakers to inform the citizenry and to arouse public interests in national issues, __9__ Congressional committees also have the power to compel testimony from unwilling witnesses, and to cite for contempt of Congress witnesses who refuse to testify and for perjury these who give false testimony. __10__

　　答案：　　考试吧

　　1 在set和for中间加上up。短语set up表示“设立”，这里用作过去分词，修饰前面的committees。

　　2 consisted改为 consisting。joint committee 是consist of 的逻辑主语，所以要用现在分词。

　　3 in改为on 。与occasion搭配的介词应该为on。

　　4 rely和outside中间加上on。rely 后面要用介词on。

　　5 out去掉。make studies 表示“进行研究”，这里没有必要用out。

　　6 its 改为 their。这里代词指代的是复数名词investigations，所以也要用复数形式。

　　7 to 和public中间加上the。表示“大众，公众”时，前面要加定冠词。

　　8 nevertheless 改为thus ,therefore。前面说国会有向社会公开调查信息的权利，本句说调查是立法者向公众传达消息的工具，这两句话之间应该是因果关系，而不是转折关系。

　　9 interests改为interest 。此处要表达的是“激起公众的兴趣：，应该用”interest。interests一般表示“利益”。

　　10 these改为those。用代词指代一群人，后面在加定语从句修饰时，代词一般要用those