1.不用小汽车事件很难的事It's hard to stop ____ ____ ____.2.废物再利用是件好事____ ____ ____ is really a good thing.(recycle)

1.不用小汽车事件很难的事
It's hard to stop ____ ____ ____.
2.废物再利用是件好事
____ ____ ____ is really a good thing.(recycle)

1. using a car
2. recycling waste things