—Jack failed the driving test again.—The question is_____ we can help him avoid making the same mistake.
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.
The present situation is very complex, so I think it will take me some time to __________ its reality.