﹣Why are the windows so dirty?﹣Because we __________ them for a long time.A. have cleaned B. haven’t cleaned C. didn’t clean
—Do you know the first ladies of China and the USA had________ interview on March 21? —Yes. And it was ________ great success.
—Why did Miss Yang look so worried when we saw her? —Because she wondered __________.
There are a lot of new buildings on ______ sides of the street.
The decision about the price _____ in a few days. So they have to wait.
—The two old friends were ____ busy ____ with each other that they forgot the time. —Yes. They hadn’t met for over ten years, so they kept talking the whole night.