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7. Prices went up because the war broke out. (because of)
8. We won't have to go to school for 3 days later this month. (off)
9. You must pay a lot to have such a damaged car repaired. (cost)
10. Perhaps Alex hasn't received my letter. (unlikely)
11. Thousands of children died of cholera last year. (death)
12. Not everyone realized the severity of environmental issues. (aware)
13. What makes them lose their hearing permanently? → What is...