1. Cell phones are used by a lot of people
2. We haven't been taught by Miss. Diep since the last semester
3. Our English lessons are taught by Mr. Vinh
4. That experiment is being done by a student
5. We are given a free period this Saturday to prepare the festival by our teachers
6. Was this dictionary bought 2 weeks ago?
7. Our teeth should be cleaned twice a day
8. I am not impressed by Alan’s knowledge about science and technology
9. All of us are driven to school by her father everyday
10. A new school is going to be built here next year