With so much work ______ , I have to stay at home for a whole day and I’m almost at breaking point.
_____ 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.