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Here are the answers to the given questions: 11. They asked a professional plumber to repair the cracks. "They had the cracks repaired." 12. Children are allowed to use the swimming pool if they are with an adult. % Unless accompanied by an adult. 13. She has to stop playing her music, otherwise her neighbors will complain. "Unless she stops playing her music." 14. Take more exercise and you will soon feel better. % If you take more exercise. 15. Stop burning trash, or it will make the environment polluted. If you don't stop burning trash. 16. You must work hard, otherwise you won't get anywhere in life. % If you don't work hard. 17. 'I'm postponing the party until next week, Jane,' said Anna. Anna told Jane that she was postponing the party until next week. 18. 'Did you take the book back to the library?' Alicia asked me. Alicia wanted to know whether I had taken the book back to the library. 19. The government lost the election because it had completely failed to reduce unemployment. The government lost the election because of its failure to reduce unemployment. 20. I argued with my mum a lot when I was younger. % I wish I hadn't argued with my mum so much. 21. I have to go to school early for an exam tomorrow. "I wish I didn't have to go to school early tomorrow." 22. They met on 14 December. It snowed all day then. (Use a relative clause) % They met on 14 December, which was a snowy day. 23. The damage caused by the floodwaters was so great in town that it took weeks to return to normal life afterwards. The floodwaters caused such great damage.