Lucy was chosen for the job because she was superior ________the other candidates.
We should work together to build a society for kids, ________free from war and violence.
He slipped(溜进) into the classroom without ___________.
This special strain of rice makes _________ possible to produce one third more of the crop in the same fields.
---Is that the small town you often talk about? ---Right, just the one ______________ you know I used to work for three years.
Although the first part of the book is easy, the rest ______.