----Whose book is this?----It _______ our geography teacher’s. You see, his name is on it.
—Andy isn’t going out this evening, is she?—_______. She has to stay at home to look after her sick mother.
—What do you do? —_______.
—Your sweater is very beautiful, Joan! —_______.
—Can I get you something to drink, Mr Smith?—_______. I am thirsty.
—Excuse me. May I use your computer? —_______. It’s broken.