Children under six are not _____ to school except those of extraordinary intelligence.
_____ is the population of China? It is about 1,300,000,000.
Some doctors suggest that vinegar will ____ people from being infected ___ H1N1.
Our school is no longer ____ it was 10 years ago, _____ it was not well equipped.
He has been acting strangely these days. I can’t _____ his actions at all.
—Is Mary coming by plane? —He should ,but he _____not. He likes traveling by train.