When I returned, I found the windows open and something      .

-- What made your skin look so terrible? --_______ to the sunlight for a long time. 

All the Chinese people are expecting the government’s four-thousand-billion financial plan ______ around the country, ______ to improve the current economic situation.

_____from the top of the mountain, the citizens find ____ the city is not _____it used to be.

Now a lot of new technologies can ______  problems in industry.