-----Alice looks blue today.-----Yes, I asked her, but she wouldn’t say _____ troubled her.
The wild flowers looked like a soft blanket _______the desert.
When ____ about the source of his income, he hesitated for a moment, obviously not willing to give us a direct answer.
In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.
—How much do you know about the 3D film technology?—A little. Not until _______the hot movie Avatar _______ some about it.
The expo is being held in Shanghai, _______a lot of advanced technology is shown for the first time.