Bob spent six months alone on his boat. _____, Ann took care of the children on her own.
At the eve of Christmas, she got nothing but $ 2 ____ to buy her husband a simple present.
_____ 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.