Exercise 1. Write a or an in the space: 1. _____ unreasonable decision 5. _____ X- ray 9. _____ elephant 2. _____ universal problem 6. _____ UFO. 10. _____ hospital 3. _____ unit of work. 7. _____ T shirt 11. _____ BBC programme 4. _____ honorable man. 8. _____ H-bomb 12. _____ UNESCO worker

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