1.We used to go to school on foot.
2.It's about 30km from my town to Ha Long Bay.
3.My family used to go on holiday at the seaside in the summer.
4.How long does it take you to go from Hanoi to Sapa?
5.There used to be a factory in the town centre but it had been moved to the suburbs.
6.You must learn about road safety before riding your bike on the road.
HOK TỐT !!!!!!!!!!