That’s a piece of cake

That’s as easy as pie!

I can do it with my eyes closed

請你客氣點

Who do you think you’re talking to?

Don’t get fresh with me (get fresh with 大多用于母親對孩子的斥責之時)

等著瞧

you’ll see. / Time will tell。

多管閑事

(It is) None of your business.

Mind your won business.

Who asked you?

This has nothing to do with you.

別狗眼看人低

Do I look like a fool?

Who do you think I am?

What kind of a fool do you take me for?

不要告訴別人

Don’t tell anybody (about it).

This is just between you and me.

This doesn’t leave this room.

This is for your ears only.