Ⅰ．单句语法填空
1．(2020·新高考卷)They kept their collection at home until it got too big __or until they died, and then it was given to a museum.
解析：考查并列连词。句意：他们把自己的藏品留在家里，直到收藏变得太大或者自己去世，然后这些藏品被捐给一家博物馆。根据语境可知，前后陈述的是两者可能性，应使用连词or“或者”。故填or。
2．(2020·新课标卷Ⅲ) __When/As he asked the villagers on the banks of the river where he could find the legendary (传奇的) artist, they smiled and pointed down the river.
解析：考查连接词。句意：当他问河岸上的村民，他在哪里可以找到这位传奇艺术家时，他们笑着指着河的下游。本句为时间状语从句，表示“当……时候”，且从句中动词asked为短暂性动作动词，不能用while引导，故应用when或as引导。句首单词首字母要大写。故填When/As。
3．(2019·全国Ⅱ卷) I work not because I have to, __but because I want to.
解析：考查并列连词。根据句意逻辑可知，此处为转折关系，句意：我工作不是因为我不得不做，而是因为我想做。此处用but与前文not 呼应，构成“不是……而是……”之意。故填but。
4．(四川)It was time for her to have a new baby, __and it was also time for the young panda to be independent.
解析：句意：是时候再生一个孩子了，熊猫宝宝也到独立的时候了。It was time for… 和it was also time for… 之间是并列关系，故用and连接。
