Are you afraid of the dark— Yes, I always go to sleep _________ the light on.

You can use a large plastics bottle, _________ cut off, as a plot to grow flowers in.

We must do whatever we can to ______the river from being polluted any more.

The cool water stops the burning process，prevents the painunbearableand reduces swelling.

I think we should learn English words by ________English songs.