4. My mother is cleaning the floor at the moment. @ The floor 5. My father is painting our house at present. @ Our house 6. Her mother is preparing the dinner in the kitchen. @ The dinner 7. They are building some new houses down the street. @ Some new houses 8.Tom will visit his parents next month. @ His parents 9. The boss will meet him tomorrow in the restaurant. @ He 10. They are going to build a supermarket next year. @ A supermarket 11. The teacher is going to explain the lesson. @ The lesson 12. They moved the fridge into the living room. @ The fridge 13. She bought some cups of coffee for the visitors in the next room. @ Some cups of coffee 14. My sister was buying some food at 11 a.m yesterday. @ Some food 15. Her mother was preparing the dinner @ The dinner 16. My sisters were cleaning the floor at 7 o’clock last night. @ The floor 17. Mary was cutting the birthday cake @ The birthday cake 18. My friend has written ten emails @ Ten emails 19.The students have discussed the pollution problems @ The pollution problems 20. He has broken his nose in a football match. @ His nose 21. Somebody has taken some of my books . @ Some of my books 22. They have provided the victims with food and clothing. @ The victims 23. We should clean our teeth twice a day. @ Our teeth 24. We must solve this problem soon. @ This problem 25. Bill will invite Ann to the party. @ Ann 26. Nam can repair this sewing machine. @ This sewing machine