The lift in that tall building went wrong and got trapped _____ floorsPeople in it had no way to get out

udy in Peking University lasted four years, ______ he founded his own company in Hong Kong.

Is it with its charming scenery and a unique culture ________ Lugu Lake impresses people from all over the world?

I don’ t want to be a person that always cries, but today apparently ____

There was thick haze（雾霾）in our city this spring. What do you think of it—I think __ cars we drive, __ pollution our city will have.