Of all the subjects, I like ____ history best because it gives us ____ useful knowledge of things in the past.
Half of the workers here ________ under 30 ________.
About 60 percent of the students ________ from the south,the rest of them ________ from the north and foreign countries.
He looked quite healthy though he was _________.
Everything is not in good order but _________.
It was January the_________he came here last time.