—The box is too heavy to carry. What's in it? —Oh, it is ________ books.
Xi’an isancient city. It haslong history.
He was very ill, but now he is out of danger.
He could play the violin when he was five.
—My mother is ill in hospital. I have to look after her. —.
—Could you please tell me ________? —Of course. Many people here know about it.