--- How many of you have solved the math problem?--- ________, the math problem is far too difficult for us to work out. .

–What do you think of the lecture?--____but interesting, but I’ve managed to survive it.

I prefer a college in Beijing to       in Shanghai, because I like the climate in Beijing.

Mr. Xue enjoyed ________ by working in Yangzhou-Taizhou Airport because he always hates ________ while staying alone at home all day long.

— Oh, dear! We only have 15 minutes to get to the station.— So terrible! There isn't any taxi around when you want ______.