Sắp xếp các từ thành câu hoàn chỉnh

1. We/used/ ride/bike/school/when/be/young

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2. There/used/a lot/traffic accidents/big cities

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3. There /used to/bus station/city centre/but/it/move/the suburbs.

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4. I/used/ go/school/foot/ when/I /be/student/primary school

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5. Children/must/learn/road safety/before/allowed/ride/bike/road/

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