1. What's the price of the book? (同义句)
    ___________is the book?
2. She likes English. (变否定句)
    She ____________English.
3. Lily usually goes to bed at nine o'clock. (对画线部分提问) 
    ____________ Lily usually ____________ to bed?
4. I have some books in the backpack. (变否定句)
    I ____________ have ____________ books in the backpack.
5. My friend is a girl. (用a boy变选择疑问句)
    ____________ your friend a girl ____________ a boy?