How long have you __________ this book?
--Must we move to the next room?--No, you____________ . You may still live here if you like.
Let’s take a walk for supper, ______ ______?
Yao Ming is one of the top basketball players in the world. We all like him.
It's a chicken-and-egg question. I can't answer you now.
Yang Shanzhou becomes well-known in China for planting so many trees for people.