(1)After that, ________ happened to the Amber Room ________ a mystery.

(2)This was a time ________ the two countries were ________ ________.

(3)He / She only cares about whether the eyewitness has given true information, which must be facts ________ ________ opinions.

(4)There’s ________ much competition among countries to hold the Olympics ________ to win Olympic medals.

(5)Only athletes who have ________ the agreed ________ for their event will be admitted as competitors.

【考点】不可数名词，连接代词和关系代词，介词短语，并列连词，从属连词，以-ed结尾的形容词，程度副词，连接副词和关系副词，动词基本形式，一般现在时，现在完成时

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