We _____(celebrate) before the news came.
had been celebrating
We _____(wait) for this moment for a long time.
had been waiting
He_____(aim) high before he reached his goal.
had been aiming
She _____(swap) the cups before she spilled the drink.
had been swapping
I _____(think) it was my fault.
had been thinking
We ____(face) difficulty before we finished.
had been facing
The event ______(go) well before it began to rain.
had been going
She ______(forget) things before she took medicine.
had been forgetting
She _____(work) hard to achieve success.
had been working
My colleague _____(check) the schedule all morning.
had been checking
I _____(wait) for a chance to face the challenge.
had been waiting
They _____(walk) in the wrong direction and got lost.
had been walking
They _____(try) for hours before they finally failed.
had been trying
He _____(gain) weight before he started running.
had been gaining