piece of cake
hit the sack
an arm and a leg
easy
taste of your own medicine
to go to sleep
to cost a lot of money
on cloud nine
the big cheese
hit the books
to do the same bad thing that someone has done to you
to eat a lot and very quickly
to be nervous
drive very fast
an important person, the boss
pig out
cold feet
to study
very happy
put the pedal to the metal
