那个所谓的艺术家其实是个装模作样的冒牌货，连画笔都拿不稳。

That so-called artist is just a ___poser who can't even hold a paintbrush properly.

这个数学竞赛的最后一题真是个难题，许多选手都被难住了。

The last question in the math competition was a real ___poser that stumped many contestants.