Animals
When pigs fly...
Never gonna happen
Piece of cake
easy
Hit the nail on the head
exact answer
hit the books
study
Raining cats and dogs
raining really hard
In a pickle
in trouble
Cost an arm and a leg
very expensive
draw a blank
can't think of it
Cat out of the bag
Cool as a cucumber
calm
Throw in the towel
give up/stop
pass with flying colors
do awesome
Hold your horses
wait
Don't over spilled milk
don't get upset over something small
Break a leg
good luck
show of hands
raise your hand to vote
Don't count your chickens before they hatch...
Don't count on something before it has happened
love dearly
In hot water
in trouble
Face the music
accept the consequences