1cell phones are used by a lot of people 2 we have not been taught by Miss diep since the last semester 3 our English lessons are taught by Mr.vinh 4That experiment is being done by a student 5 we are given by our teachers a free period this Sunday to prepare the festival 6 was this dictionary bought by you two weeks ago 7 our teeth should be cleaned by us twice a day 9I am not imperessed by alan’s know ledge about science and technology 8 all of us are driven by her father to school every day 10A new school is going to be built by them here next year kiem tra cho em xem dung khong a em chuyen thi bi dong