China began selling tickets for the Wuhan-Guangzhou high-speed railway, ______ boasts the world's fastest train journey with a 350km per hour average speed.
Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
He often dreams of going_____.
The boy slipped out of the room and headed for the swimming pool without his parents' _____.
In fact, _______ one cause that leads to the problem.
I found her sitting in the corner, reading _____ newspaper, with _____ in her eyes.