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

【答案】improving

【解析】

句意:李先生把他的一生都投入到改善他周圍的環(huán)境上去了。

根據(jù)文中“devote to doing sth.”致力于做某事,該短語(yǔ)中的to是介詞,后面跟動(dòng)詞的ing形式,所以用improveing形式。故填improving。

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