经济增长速度越来越快。

The economic growth is ___accelerating.

他轻轻踩下油门，让汽车加速超过了前面的卡车。

He pressed the pedal lightly, ___accelerating the car to pass the truck ahead.

她踩下油门，汽车开始加速。

She pressed the gas pedal and the car started ___accelerating.