Not believing their eyes, the visitors on the spot _______ the flying plane, doing some most difficult and dangerous tricks in the sky.
With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________.
--How did you find the film Harry Potter and the Deathly Hallows?--________. I can’t think too highly of it.
The soldiers have to stand for hours without changing ________.
There are many islands ________ the southeast coast of China.
Jumping out of ________ airplane at ten thousand feet is quite ________ exciting experience.