1. This … a book. 2. These … long texts, and those … short texts. 3. Those doors … black. 4. That pencil … not black. It … red. 5. … this book good? 6. Ben … my friend. 7. He … a teacher. 8. I … in my room. 9. Tommy and Billy … babies. 10. … Mike and Ann doctors? – Yes, they … . 11. … those men friends? – No, they … not. 12. Mary and I … friends. 13. You … welcome. 14. She … out at 10 yesterday. 15. It … 5 o’clock now. 16. How … you? – I … fine. 17. She and her children … at home yesterday in the evening. 18. … you glad to see her? – No, I … not. 19. It … a rainy yesterday. 20. It … not good to say so.