We need to rack our brains to come up with a solution
She had to rack her brains to remember his name
I've been racking my brains all day to figure this out
Can you rack your brains and think of any other possibilities?
Let's rack our brains together for some new ideas
He tried to rack his brains to recall the password
The detective had to rack his brains to solve the mystery
They were racking their brains for a way to escape
You'll have to rack your brains to remember where you left it
I'm racking my brains, but nothing comes to mind
I cannot remember the answer to this question.
You will need to rack your brains for a while.
I am trying, but it is still not coming to me.
You'll have to rack your brains to solve this puzzle
You'll need to think very hard to solve this puzzle
This puzzle will require intense thought to solve