The boy was so tired that he fell asleep _______ hismother could take off his clothes

Colours can make us orsad.

Can you get me some of the novels?—By all means. All but one of them ____ in our company.

s a _____ in our office that when it’s somebody’s birthday, they bring in a cake for us all to share.

_______all kinds of difficulties，the workers have made rapid progress in the construction of the World Expo 2010 Shanghai