1．(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______ a try.
解析：it/running 根据句意可知，此处表示“我们都应该尝试着跑跑步”，故填代词it，指代上文的running，此处也可直接填名词running。
2．(2018·全国卷Ⅲ)When the gorillas and I frightened each other, I was just glad to find________ (they) alive.
解析：them 人称代词作宾语时，要用其宾格。空格前面是动词find，空格处应用宾格，故填them，指代上文的gorillas。
3．(2018·6月浙江高考)Many westerners who come to China cook much less than in their own countries once they realize how cheap ________ can be to eat out.
解析：it 此处应用it作形式主语，动词不定式短语to eat out为真正的主语。
4．(2017·6月浙江高考)“She thought I had hurt ________ (I)，”says Pahlsson.
解析：myself 句意：Pahlsson说：“她以为我伤到了自己”。根据前面的主语I可知，此处要用反身代词作宾语。
5．(2016·全国卷Ⅰ)On my recent visit, I held a lively threemonthold twin that had been rejected by ________ (it) mother.
解析：its 句意：在最近的一次参观中，我抱着一对可爱的、三个月大的双胞胎大熊猫中的一只，这只大熊猫被它的妈妈遗弃了。此处应该使用形容词性物主代词its作定语，修饰名词mother。
