As the quality of the city’s air continues to give rise to ______, the residents are encouraged to set off fewer fireworks.
_____ wants to study well must learn things _____.
Having ended the major combat (主战), President Bush_____ rebuilding Iraq.
_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
_____ I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery.
The door opened and in _____.