Advertising is different from other forms of communication in that the advertiser pays for the message         .

—Why do you hang that photograph above the fireplace?
— ______ visitors of the memorial days of Long March，Sir.

I am looking forward to ______ your answer as soon as possible.

He sat at the desk, __________ a novel.

—Why are you so disappointed?
—I went there hurriedly and waited there for 3 hours, ______ the tickets have been sold out.

—What are you doing outside the class? Didn’t you hear the clock ______?
—Sorry, sir. I ______.

The old professor travelled from one school to another, _______ first-hand information about the education situation in China.

Generally speaking，prices of daily goods     through the Internet are lower than store prices.

I’m going to Fuzhou tomorrow. Have you got anything ___ to your parents there?

__________ many times, he finally understood it.