Finally, the young explorer, through a series of lucky accidents, arrived ______ was so-called the valley of death by the locals.
_____ private cars bring us convenience, they also cause more traffic accidents and pollution.
______ around the Water Cube , we were taken to see the Bird’s Nest for the 2008 Olympic Games.
Her book didn’t ____ children probably because she employed too many scientific terms.
After years of research, he found the key ____ differences between species.
--- Do you know Anna’s telephone number? --- ______. As a matter of fact, I don’t know any Anna, either.