—Where’s David?—He ______ be in the playground because he is fond of playing basketball.
The Great Wall of China is ______wall in the world.
_____ is not difficult to learn English well.
We can still do the work better with_____ time and______people.
-Shelly, it’s cold today!_______put on more clothes? -Ok.
It is said there are ______ of people in the city of Wenzhou.