Chuyển những câu bị động dưới đây thành câu chủ động. 1. A gift was sent to me by my old students. _____________________________________________________________________ 2. You are not allow by the teacher to cheat in the exam. _____________________________________________________________________ 3. My table is being fixed by my father. _____________________________________________________________________ 4. How long has this fax machine been used by Mr. Green? _____________________________________________________________________ 5. The singer was not recognized by his fan when he was at the restaurant. _____________________________________________________________________ 6. He will be disqualified from the competition by the judges if he uses drugs. _____________________________________________________________________ 7. All the unnecessary lights will be turned off to save energy. _____________________________________________________________________ 8. Jane was prevented from staying up too late by her mother. _____________________________________________________________________ 9. Was this document typed by Mr. Brown? _____________________________________________________________________ 10. Many dead people were found by the recuers after the earthquake. _____________________________________________________________________