1. Why didn't they help him? → Why wasn't ___________________________________________ 2. How can they open this safe? → How can this safe ___________________________________________ 3. How did the police find the lost man? → How was ___________________________________________ 4. How long have they waited for the doctor? → When ___________________________________________ → How long ago ___________________________________________ 5. How many marks does the teacher give you? → How many marks were ___________________________________________ 6. Who lend you this book? → By whom ___________________________________________ 7. They will hold the meeting before May Day. → The meeting ___________________________________________ 8. Somebody has taken some of my books away. → Some of my books ___________________________________________ 9. They can't repair the engine of the car. → The engine ___________________________________________ 10. They many use this room for the classroom. → This room ___________________________________________ 11. The teacher is going to tell a story. → A story ___________________________________________ 12. John used to visit his parents at weekends. → John's parents ___________________________________________ 13. They use milk for making butter and cheese. → Milk ___________________________________________ 14. They have provided the victims with food and clothing. → The victims ___________________________________________ 15. My sister can speak four languages. → Four languages ___________________________________________ 16. The students are writing the lessons now. → The lessons ___________________________________________ 17. Her teacher taught her how to apply this theory. → She ___________________________________________ 18. Someone will tell him that news. → He ___________________________________________ → That news ___________________________________________ 19. Minh last wrote to his pen pal five months ago. → Minh has ___________________________________________ 20. The last time we visited Kuala Lumpur was 3 years ago. → We last ___________________________________________ → We have ___________________________________________ → Kuala Lumpur wasn't ___________________________________________ → Kuala Lumpur hasn't ___________________________________________ 21. When did you study English? → How long ___________________________________________ → How long ago ___________________________________________ 22. They began building this house 2 months ago. → This house has ___________________________________________ → They have ___________________________________________ 23. My father started to work in this factory last week. → My father has ___________________________________________ 24. How long has he worked in the garden? → When ___________________________________________ → How long ago ___________________________________________ 25. How long ago did you learn music? → How long ___________________________________________