1. Mr. Thanh didn't use to travel to Korea five years ago.
2. It's about 250 km from HCM City to Da Nang.
3. My hometown used to be a small village.
4. How far is it from HN to Singapore?
5. Lana used to go on foot to school or by car?
6. He used to be a good student but now he is a poor student.