1. I used to be afraid of flying in an airplane. (改为同义句)
    I used to be afraid ___________ in an airplane.
2. I don't know how I can swim well. (改为简单句)
    I don't know ___________ well.
3. It seems that he has passed the exam. (改为简单句)
    He __________ passed the exam.
4. I used to have long hair. (改为同义句)
    I ___________ have long hair ___________.
5. You used to play the piano, ___________? (完成反意疑问句)