My aunt __________ (clean) the kitchen.
had cleaned
The bus _________ (leave) when I arrived.
had left
Carlos _________ (take) the garbage out before his mother arrived.
had taken
Chinese people _________ (invent) gunpowder before humans found electricity.
had invented
I thought I knew him. Maybe, I _________ (see) him before.
had seen
They __________ (forget) their assignments.
had forgotten
Martha ________ (call) me before the problem started.
had called
I ________ (eat) sandwiches before.
had eaten
Camila didn't have her cat. She ___________ (adopt) a new dog.
had adopted
Tommy ________ (drive) cars before riding horses.
had driven