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Over the past l00 years，sea level      steadily as a result of global warming．

When Tony came to himself, he found himself       to a big pole in a dark house.

I _____ when it began to rain．

I would love ______ to the party that evening, but I had an unexpected visitor．

All possible means ___ been tried to stop the air______.

I’d like to have visited the Palace Museum, but something unexpected _______ to my father.

－What are you busy with ? 
－The conference _______ in our city next week.

It is reported that the underground system      in Changsha now will be open in 2015.

—Why didn’t you go out to meet the new forging teacher?
—I would have, but I         the spelling mistakes in my homework.

I ___ on my report next week so I won’t be able to meet you any day.