sham|shams

他的笑容只是个伪装，其实心里很难过。

His smile was just a ___sham, hiding his inner sadness.

那些所谓的名牌手表其实都是些假货。

Those so-called luxury watches are actually just ___shams.

那个自称专家的家伙其实是个骗子。

That guy who claimed to be an expert was actually a ___sham.