ĐỀ BÀI: Viết lại câu bằng cấu trúc "used to"
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5. Dennis gave up smoking three years ago.
6. My parents lived in the USA when they were young.
7. Jim was my best friend, but we aren't friends any more.
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8. When he was younger, my uncle was a national swimming champion.
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9. I eat ice-cream now, but I disliked eating it when I was a child.
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10. When Barbara was in Italy, she stayed with an Italian family.