19．It is known to all that fresh air isbeneficialto our health and the new park benefits us all，so we should keep it clean．（benefit）

分析 眾所周知，新鮮的空氣對我們的健康有益．而且新的公園對我們都有益，因此我們要保持它的清潔．

解答 答案：beneficial
解析：本題中that引導(dǎo)的是主語從句，而句首的It作形式主語；根據(jù)句意"新鮮空氣對我們的健康有益"可知，本題考查be beneficial to"對…有益"這一固定短語．綜上，本題答案為：beneficial．拓展：benefit from 意為"從…中受益"．

點評 本題考查單詞填空，做此類題目時一定要仔細分析句子結(jié)構(gòu)，確定所缺成分；再結(jié)合所給的中英文提示及題干中其他要求填入正確單詞．

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