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Here are the answers: 3. higher, more 4. more convenient, easier 5. louder, more 6. better, smoother 7. more expensive, higher 8. more modern, less 9. more, greater 10. cleaner, more 11. closer, more 12. more efficient, cleaner 13. higher, harder 14. more, better 15. more affordable, easier Here are the completed sentences with the correct phrasal verbs: 1. The city council has decided to carry out a plan to improve public transportation and reduce traffic congestion. 2. If you come down with a cold, make sure to rest and drink plenty of water. 3. On weekends, I usually hang out with my friends at the local café. 4. Despite the heavy traffic, he managed to get around the city quite easily using public transport. 5. I was surprised to find out that they had moved to another city without telling anyone. 6. Parents often take care of their children by working hard to provide for them. 7. By cutting down on using our cars, we can significantly decrease traffic congestion during rush hours. 8. My grandmother will hand down her jewelry to me when I'm older. Here are the complete sentences using the given words: 1. The harder you study, the smarter it is to become. (Corrected sentence: The harder you study, the smarter you will become.) 2. The more exercise you do, the better you will feel. (Corrected sentence: The more exercise you do, the better you feel.) 3. The less noise there is, the easier it is to work. (Corrected sentence: The less noise there is, the easier it is to work.) 4. The higher the rent, the smaller the apartment becomes. (Corrected sentence: The higher the rent, the smaller the apartment becomes.) 5. The colder the weather, the less people go outside. (Corrected sentence: The colder the weather, the fewer people go outside.) 6. We need to find out which books in the library are interesting. (Corrected sentence: We need to find out which books in the library are interesting.) 7. I will pick you up at the station at 5 PM. (Corrected sentence: I will pick you up at the station at 5 PM.) 8. We should cut down on using plastic bags. (Corrected sentence: We should cut down on using plastic bags.) 9. The council has decided to carry out the project. (Corrected sentence: The council has decided to carry out the project.) 10. She will come down with a cold if it gets you. (Corrected sentence: She will come down with a cold if she gets it from you.) Note: Some of the given sentences were corrected to ensure proper grammar and clarity.