Who ________a theory about black holes?
George is _________ a very serious man, but as a matter of fact he has a great sense of humour.
He has learned to get on with all kinds of people and _________ todifferent ways of life.
The town has _________ population of ten thousand and 80% of _________ population are peasants.
Though he have been here for several weeks, he still couldn't —_________ to the life here.
— Michael was late for Mr Smith's oral class this morning, —_________? As far as I know, he never came late for class.