A task or activity that is easy to complete
A piece of cake
To get permission to do something
Get the green light
Someone who reads a lot
Bookworm
Raining very heavily
Raining cats and dogs
To look and feel fantastic
Look like a million bucks
A person who is being lazy and watching too much television
A couch potato
Very rarely
Once in a blue moon
Very quiet
As quiet as a mouse
Extremely fast
Lightning fast
To earn money, to achieve success (hint: involves a breakfast food that Ms. Heximer doesn't eat)
Bring home the bacon
That is just how it is
That is the way the cookie crumbles
To pass something with a high score
To pass with flying colours
Eat a lot, in large quantities
Eat like a horse
To feel mildly ill or sick
Feeling under the weather
It is not easy to get money, implies that the person you are addressing spends money too easily
Money does not grow on trees
Have more important things to do
Have bigger fish to fry
The idea that things would be better if they were different
The grass is greener on the other side
To solve two problems with one action
Kill two birds with one stone
Very, very happy
On cloud nine
It takes a long time to do something worth doing (hint: involves an ancient empire)
Rome wasn't built in a day
Nearly identical, very similar
Two peas in a pod
A very good and perhaps rare chance to achieve something
A golden opportunity
Told a secret that was supposed to be kept quiet
Let the cat out of the bag
Have unrealistic or impractical ideas
Head in the clouds
To do something rather than just to talk about it
Put your money where your mouth is