1．(2020·新高考卷)As well as looking at exhibits, visitors can play with computer simulations (模拟) and imagine __themselves (they) living at a different time in history or walking through a rainforest.
解析：考查反身代词。句意：除了观赏展品，游客还可以玩电脑模拟游戏，想象自己生活在一个不同的历史时期，或者漫步在热带雨林中。此处指代visitors，意为“他们自己”，应使用反身代词。故填themselves。
2．(2020·新课标卷Ⅰ)Data about the moon’s composition, such as how much ice and other treasures it contains, could help China decide whether __its (it) plans for a future lunar (月球的) base are practical.
解析：考查代词。句意：关于月亮构成的数据，比如它含有多少水和其他财富，可以帮助中国决定它未来月球基地的计划是否实用。根据空后的名词plans可知，此处应使用形容词性物主代词it。故填its。
3．(2018·全国卷Ⅰ)If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give __it/running a try.
解析：考查代词或名词的用法。句意：如果你时间不充裕，你只需要花费其他运动一半的时间去跑步便可获得同样的好处，因此或许我们都应该试试跑步。此处give it a try意为：试试。此处it可以指running。故填it或running。
