1．(2018·全国卷Ⅰ)According to a review of evidence in a medical journal, runners live three years ________ (long) than nonrunners.
解析：longer 根据空后的than和语境可知，此处应该使用副词比较级形式，故填longer。
2．(2018·全国卷Ⅲ)He screams the ________ (loud) of all.
解析：loudest 根据空前的the以及空后的of all可知此处应用副词最高级。
3．(2018·6月浙江高考)There could be an even ________ (high) cost on your health.
解析：higher 此处表示这么做可能还会让你付出更高的健康代价。根据even可判断，此处要用形容词的比较级。
4．(2017·全国卷Ⅰ)As a result, people will eat more food to try to make up for that something missing.Even ________ (bad), the amount of fast food that people eat goes up.
解析：worse 根据语境可知，此处表示程度的加深，所以用副词比较级形式，even worse表示“更糟糕的是”。
5．(2017·6月浙江高考)Sixteen years ________ (early), Pahlsson had removed the diamond ring to cook a meal.
解析：earlier sixteen years earlier表示“早在16年前”。此时的earlier相当于before，一般直接跟在时间名词的后面。
6．(2016·全国卷Ⅱ)If you feel stressed by responsibilities at work, you should take a step back and identify (识别) those of ________ (great) and less importance.
解析：greater and连接并列成分，根据后面的less可知，此处要用形容词比较级形式。
