当狗咆哮时，她后退了。

When the dog growled, she ___backed ___away.

他把车倒进了一棵树。

He ___backed the car ___into a tree.

当他从停车场倒车出来时，差点撞上另一辆车。

When he ___backed ___out of the parking lot, he almost crashed into another car.