Wheredid you get this book—I picked it up from a second-hand bookshop if you______know

A clean environment can help the city bid for the Olympics, ________ in turn will promote its economic development

Many of the one-family children are so accustomed to ______ that they react violently when they hear something different. [ ]

Since then the number of people taking driving lessons______20%

__________must be working in the office, I think. –Sure, the light is still on.