1. I used to go to school on foot when I was small
2. we didn't use to drink milk tea
3. although we have car, we often...
4. jack likes living in the city despite its noise and 
5. how long have you learnt...
6. it is not far from her house...
7. I'm not interested in ...
8. did you use to wear new clothes at Tet?
9. paul walks to school despite having a bike
10. he chooses to study social science although he loves art
11. they didn't use to celebrate christmas when thay were young
12. she used to get any lucky money at tet
13. the test was very dificult; however, he could do it very well
14. we were amazed at seeing the colorful kites flying in the sky