Ответ: 4. She must be trying to find old letters5. They must be admiring the beauty of south nature6. He must have returned from the South7. She must have lost my address8. They must have finished their work9. He must haven’t told all the truth to the judge10. She must have prepared all this some time before11. He must be still here.12. They must have just arrived 13. He must have taken all the papers with him14. Someone must have been here15. They must be laughing at him16. They must have been living here then17. It must be here