Question

【题目】Mr Lee devoted all his free time he had to________ (改善) the environment around him.

Answer 1

【答案】improving

【解析】

句意：李先生把他的一生都投入到改善他周围的环境上去了。

根据文中“devote to doing sth.”致力于做某事，该短语中的to是介词，后面跟动词的ing形式，所以用improve的ing形式。故填improving。