Practice choosing between Simple Past and Past Perfect

The thief --had escapedescaped before the police --had arrivedarrived .

She --learnedhad learned to drive before she --had boughtbought her first car.

They --atehad eaten lunch before the meeting --startedhad started .

He --lefthad left the house when it --had begunbegan to rain.

By the time I --foundhad found my keys, I --missedhad missed the bus.

She --had writtenwrote the report before the deadline --had arrivedarrived .

By the time we --cleanedhad cleaned the house, the guests --had comecame .

He --had graduatedgraduated before he --gothad gotten his first job.

When we --had reachedreached the peak, we had --tooktaken several photos.

She had already packed her bags when he --offeredhad offered to help.