He has butterflies in his stomach.

Put on your thinking cap.

She´s down in the dumps.

They're going bananas!

We see eye to eye.

Don't cry over spilled milk.

That knocked my socks off.

I had to eat my words.

It costs an arm and a leg.

She's afraid of her own shadow.

It's a piece of cake.

I'm green with envy.

I'm feeling under the water.

The cat's got her tongue.

She got cold feet.

Bite off more than you can chew

bark up the wrong tree

Every one has the Beat by Dre earbuds. They are a "a dime a dozen" this means

a drop in the bucket

go out on a limb

let the cat out of the bag

let sleeping dogs lie

A leopard never changes its spots.

see eye to eye

Pull the wool over my eyes

to break the ice

straight from the horse's mouth

bit off more than you can chew