【正确答案】At first, I could not understand this. But now I come to realize we shouldn't waste time at any time or place.

【答案解析】whenever和wherever可用于表示“无论何时何地”，但它们一般用于动词或动词词组之前。词句强调意味强，改用at any time or place为宜。此外，understand为及物动词，当填人代词this。