Somebody's ears are burning:

耳朵在燃燒 X

感覺有人議論自己 耳朵發熱 √

例句：

I bumped into your ex-wife last night.

我昨天晚上偶然遇到你的前妻。

I thought I could feel my ears burning.

怪不得我好想覺得耳朵發熱呢。

Be out on your ear:

被開除了 √

例句：

You have to get it right or you are out on your ear.

你必須把這件事做好，不然你就會被解雇。

With half an ear:

不專心（聽） √

例句：

I was only listening to the radio with half an ear, while preparing some food.  

我正在做吃的，沒太留心聽收音機。