Here are the sentences based on the words provided:

1. There used to be a church near the post office in my town.
2. While I open the letter, the phone rings.
3. I prefer to go out for a meal rather than stay at home.
4. I invited Bill to the party, but he could not come.
5. Unfortunately, her illness is more serious than we thought at first.
6. She says she enjoys Vietnamese food very much.
7. I will tell him the truth if I were you.
8. My father used to smoke when he was young.
9. Mai is worse at Math than Lan Anh.
10. Hoa has more books than her sister.