The villagers dug many tunnels _____ they could fight against the enemies.
---What do you think of our design for the new car? ---Pretty good. But I find theirs is _____ worth considering and study.
Obama, _____ president of the USA, won _____ Nobel Prize for Pease in 2009.
Women’s earnings are well below men’s _____ educational difference that are decreasing between the two sexes.
---How much salt did you put in the soup? ---I’m sorry to say, _____. I forgot.
Despite the fact that Lucy is a lovely girl, she _____ be extremely difficult to work with sometimes.