1. John swam every morning when he was a young man.
→ John used ............................................................................................................................
2. She often works at night. She is accustomed to that.
→ She is used .........................................................................................................................
3. People often guarantee the value of the paper money by gold.
→ Gold is used .......................................................................................................................
4. I drew a straight line with this ruler.
→ This ruler was used ........................................................................................................
5. The foreigner finds it strange to wear “Ao dai”.
→ The foreigner is not used ............................................................................................
6. When I was in high school, I ate breakfast in the canteen.
→ I used ....................................................................................................................................
7. We can clean our teeth with toothpaste.
→ Toothpaste is used ..........................................................................................................
8. I rode my bicycle to work when I was young
→ I used ....................................................................................................................................