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1. an 2. - 3. -, a violin... 4. the 5. a 6. the 7. -, the capital, - 8. -, -, from the USA 9. the 10. a 11. a 12. a 13. -, a new office 14. - 15. a, - 16. -, in the north, - 17. an, an.
mouse - mice, hobby - hobbys, match - matches, party - partys, child - children, boy - boys, family - familys, man - men, furniture - furnitures, woman - women, homework - homeworks, shelf - shelfs.