-- _____is that used for?---_____ the floor.
__________ the website of the Fire Department in your city, and you will learn a lot about firefighting.
This is one of the experiments __________ in our laboratory.
As we all know,__________ Siberian tiger is __________ endangered species.
I am __________ with living with a man of this kind.
The poor child who lost his parents in an accident was __________ by a kind-hearted villager.