Put questions to the missing parts of the following sentences: 1. They are having a lesson. 2 tk is teaching them English. 3. He is teaching lumEnglish. 4. The teacher is writing ... on the blackboard. 5. He is writing with 6. The students are 7. They are looking at ... . 8. The teacher is speaking 9. He is speaking to ... . 10. The students are listening to ... 11. ... are going to the blackboard. 12. They are going to 13. ... are falling from branches on the ground. 14. We can see... birds flying high in the air. 15. The birds are flying to 16. ... are running about in the garden. 17. ... people are walking down the road. 18. ... is carrying a large bag. 19. She is carrying ... exercise-books in her bag. 20. She is coming from ... . 21. The old man is sitting on 22. ... is speaking English. 23. The old man is listening to