Jacky is so careless. He my books and pens the floor when he walked past my desk just now.
---How ____ is it from here Ningbo to Xi'an? ---It's about two ____ flight.
---What he enjoys _____ great and interesting. ---Yes,____ it's dangerous.
---Why not for a walk with me this afternoon?---I prefer computer games at home.
---Why don't you go to the lecture-room and listen to the talk? ---I hear there isn't ________in it.
There are books on the shelf. And them is about three hundred.