6. Add question-tags to the following statements.
1. You have read this book. 2. She has not met her colleagues today. You have already finished your work. 4. You have not yet read Live with Lightning in the origi- nal. 5. She has never been to the Far East. 6. They haven't yet gone to the tennis court. 7. He has already written the test-paper. 8. Mother hasn't come yet. 9. You have already returned the book to him. 10. We have not yet been there.