Can you imagine what difficulty we had __________ home in the snowstorm?A walked B. walk C. to walk D. walking
Qiandao Lake, widely known ______ a tourist site, is famous _____ its clear and drinkable water.
We have every reason to believe that __________ 2012 London Olympics will be ________ great success.
—Madam, could you please tell me how to get to the nearest post office? —_______
Entering the room, I found Mary ______at the desk and ______a letter.
_________on the main street, the market was busy yesterday.