1. But truth is in the eye of the behold...

behold：注视、看

例：
My money is restored! Behold, it is even in my sack.
我的银钱退回来了；看，仍在我的袋里。

Now I don't know why I behold the sky.
现在的我并不真正明白，为什么我这样注视着天空。

2. Now they're in for it.

in for：免不了遭受

例：
Living on the earth, we are in for some natural disasters.
生活在地球上，免不了要遭受一些自然灾害。

It looks as if we are in for a big storm.
看来我们一定会碰上一场暴风雨。

3. Run, you yellow-belly...

yellow-belly：胆小鬼

例：
Joe is a yellow-belly guy; don't send him on such a tough assignment.
乔是个胆小鬼，不要把这样艰难的工作交给他。

4. Please, have mercy.

mercy：仁慈，宽容

例：
Fire and water have no mercy.
水火无情。

Have mercy on the poor sinner.
宽恕那个可怜的罪人吧。