小事一桩

That's a piece of cake

That's as easy as pie!

I can do it with my eyes closed

请你客气点

Who do you think you're talking to?

Don't get fresh with me (get fresh with 大多用于母亲对孩子的斥责之时)

等着瞧

you'll see

Time will tell

多管闲事

(It is) None of your business

Mind your won business

Who asked you?

This has nothing to do with you

别狗眼看人低

Do I look like a fool?

Who do you think I am?

What kind of a fool do you take me for?

不要告诉别人

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

当然

you bet

you know it

you betcha

你在开玩笑

you are kidding(joking)

you have got to be kidding(joking)

Are you kidding(joking)

没错，就是这样

you got that right

you wit the rail on the head

世界真小

It is a small world

Small world!

You never know whom you will bump into