Exercise. A/an, the 1. The DOOR is locked. Where is the key? 2. This is a hat. It isn’t my hat. 3. Is this a tie? – No, it isn’t a tie, it’s a shirt. 4. Is this a cat, or a dog? – This is a dog, it is eating a bone. 5. My pen is bad. Give me a pen, or a pencil. 6. A dog chased a cat. The dog was big and brown; the cat was small and white. 7. Sam bought a newspaper and a magazine. The newspaper is on the table, but the magazine disappeared. 8. Tom lives in a big house not far from an office. There is a garden near the house. 9. Mary is a secretary. 10. Have you got a book? Give me the book. 11. Does Tom collect stamps? 12. Would you like an apple? 13. Mary has got a small flat in the center of a city. 14. This is a nice house. Does it have a garden? 15. Have you finished reading a book which Mike gave you? Return him the book, please. 16. Today I had tea and a sandwich for breakfast. 17. Tom had a large breakfast today. 18. My father is an engineer. He works at the plant. The plant is big. 19. She works at school. The school is good. 20. My sister is a doctor. She works at the hospital. She is at work now. 21. My son is a pupil. He is a good pupil. He is not at school now. He is at home. He is having dinner. He is eating soup and bread. 22. I have got a small black dog. It likes meat very much. 23. I met him in a small town. 24. The girl is waiting for you in the room. Where is a dictionary? – It is in bookcase. 25. A man phoned you in the morning. 26. The door opened and a man with a briefcase in his hand came into the room. 27. Please, buy ink and paper. 28. Do you like milk? 29. Children need milk. 30. Where is sugar which I bought? 31. Buy sugar, please. 32. It is March now. 33. We shall have an English lesson on Tuesday. 34. It is cold in winter here. 35. In Russia it is always cold in winter. 36. English is spoken in USA. 37. German is a difficult language. 38. I prefer the forest in autumn. 39. We used to go for long walks in summer. 40.There is curtain on the window. thank you