按要求完成下列各句。 1. His mother doesn't allow him to get his ears pierced.(改为被动语态) He _____to get his ears pierced. 2. He thinks he can pass the exam.(改为否定句) He _____think he_____ pass the exam. 3. I don't think sixteen-year-olds should be allowed to drive.(改为反意疑问句) I don't think sixteen-year-olds should be allowed to drive, _____ ? 4. Alice is too young to go to school.(改为同义句) Alice isn't _____to go to school. 5. Nobody can answer the question.(改为被动语态) The question_____ answered by anybody.