A long day's night

Live long and prosper

Long time no see

The long and short of it

It was a list as long as your arm

Making a list and checking it twice

I'm checking to make sure you're still here

The check is in the mail

I gotta check with the wife first.

You better check yourself before you wreck yourself

I'll take a rain check

It's been raining cats and dogs

The dog ate my homework

Dog eat dog world

You can't  teach an old dog new tricks

Giving the dog a bone

Gonna bone up on that before the test

Don't test the water

I aced that test!

You're testing my last nerve

I passed the test with flying colours 

Testing 1,2,3, testing

I coulda done that test with my eye closed 

You're a little testy today

It passed the sniff test