1. ______'s this called in English? 2. ______ book did you buy? 3. _____ doesn't understand what the teacher has explained? 4. _____ children are they? – The Browns'. 5. _____ are you learning now? 6. _____'s the weather like today? 7. ______ do you prefer: ''U2'' or "AC/DC"? 8. _____ does she do for a living? 9. _____ do you know about this subject, and who taught it to you? 10. _____ is the longest river in the world: the Amazon or the Nile?