--- Look at ______ book on the desk . Is it ______ useful one ?--Yes, it is . In the book there is much advice on how to learn math well.
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.
—Does your son ________an hour________ his homework every day after school?—No, shorter than that now, about half an hour.