________bird flu outbreak has killed 545 chickens and ducks in________central China and led authorities to destroy 2,487 others.
The building the windows are bright at night is our school library.
It was not until dark _____ he found _____ he thought was the correct way to solve the problem.
_________ this is the biggest mistake we have made.
It i s the second time that the poor area_______.
In modern times, the development of science is ________ .