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Teacher's pet.
The teacher’s favorite student.
Raining cats and dogs.
It is raining very hard.
To eat a lot.
Night owl.
Someone who stays up late.
It cost an arm and a leg.
It was expensive.
I'm all ears.
You have my full attention.
Give it a shot.
To try to do something.
For good luck.
Cat got your tongue.
Why aren’t you talking?
As easy as ABC.
Something is very easy.
Nose in a book.
Reading.
Queen bee.
The person in charge.
Giving the cold shoulder.
Ignore someone.
Hold your horses.
Wait a minute.
In hot water.
In trouble.
Let the cat out of the bag.
Told a secret.
Piece of cake.
Slipped my mind.
I forgot.
When pigs fly.
To say something is impossible.
Cool as a cucumber.
Very calm.
Crack a book.
Open up a book and study.
Call it a day.
Time to quit.
A bookworm.
Someone who likes to read a lot.
Have a change of heart.
Change your mind.
Get cold feet.
Nervous.