一清二楚

The accounts don't seem to be as clear as crystal.

一意孤行

That boy is always going her own way. He won't listen to his parents' advice.

一落千丈

My son's schoolwork has gone to pot. He really lets me down.

一鸣惊人

His performance at school really comes as a bombshell.

一诺千金

He never goes back on his word. He is as good as his word.

一时兴起

Don't always do things by fits and snatches.

一蹴可及

You should know that it is impossible to make it at one stroke.

一筹莫展

I really have no idea what to do. Now I am at my wit's end.

一览无遗

If you stand here looking down at the city. The wonderful scenewill be in full view.

一窍不通

What you said is all Greek to me.