题目内容

While conservatives today play a dominant role in mainstream politics, there was once a time when they were on the ____ of American political life.

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The World Health Organization (WHO) was established in 1948, and one of its first responsibilities then was to_____ the separate international health-related treaties in a single code.

Because of over-hunting,the number of certain types of whales has been reduced so greatly that they are in danger of becoming____.

The senator,who was against the war, claimed that with all the _____and complex economic and political factors, the outcome of the war was still uncertain.

Online shopping and other electronic services could well______ the number of entry-level jobs in the traditional retail sector.