—A number of people ________ learning English nowadays.—Yes. The number of people who are learning English ________ increasing.
Great changes __________ in our hometown in the past twenty years..
John, look at the time. ________ you play the piano at such a late hour?
He looked as though he _________ a ghost(鬼).
He stood for an instant with his hand still ___________.
_____ is known to all, the age _______ children can go to school is seven.