这个老房子虽然年代久远，但保养得很好。

The old house, though aged, is remarkably ___well-kept.

他外表看起来是个普通的上班族，实际上却隐藏着一个精心保守的犯罪秘密。

He appeared to be an ordinary office worker, but in fact had a ___well-kept criminal secret.