他一眼就能看出有什么不对劲。

He could tell ___at ___a ___glance that something was wrong.

你一眼就能看出彼得是个孤独的人。

You could tell ___at ___a ___glance that Peter was a loner.

我一眼就能看出解决方案有缺陷。

I could see ___at ___a ___glance that the solution was flawed.