—Where is Jack? I haven’t seen him for a long time.—He ______ HK with his family. I think he is having a wonderful time there.
---Have you ever _____ the Great Wall? ---Yes, I have.
---_____ riding your bike to the park? ---Good idea.
Liu Sanzi is _____ eight-year-old boy from village.
—Could you post the letter for me?—_______________
—How do you like the book?—________________