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With the land of the city becoming rare, more and more high-rise buildings are under construction around the Jingmen City ___________ space.

Recycling is one way to protect the environment;reusing is ______.

It was __________ computer games that costthe young man a lot of precious time that heshould __________ on his lessons．

John accidentally ______ he had once quarreled with his wife and that he hadn’t been home for a couple of weeks.