1. We used to go to school on foot.
used to do sth: đã từng làm gì trong quá khứ
2. It is about 80km from Bac Ninh to Ha Long Bay.
3. I go to the city centre in 15 minutes by car.
4. They used to play chess in their free time.
5. He travels to HCM City in 2,5 hours by plane.