Beijing isn’t what it used to be. The last decade _______ great changes in the city images.
It was not until dark ______ he found that it was the correct way to solve the problem.
_______ breaks the law should be punished.
Einstein was __ a great scientist. He did a lot for human rights and progress.
_________ the lecture going on, the students got more and more interested.
He is such a lazy man _______ nobody wants to work with him.