Choose the answer that is nearest in meaning to the printed before it. 

Although she has less teaching experience than the other staff member, she is one of the best teachers.

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China has already been experimenting with ways to make its cities more ______ for the last two decades.

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New York has invested substantially in improving the ______ of its waterways in recent years.

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Vancouver is often considered to be one of the most ______ cities in the world.

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We will need new technologies to generate energy and use it in clean and safe ways, only from fully ______ sources.

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As we move toward 2050, we are facing the consequences of _____ urbanization and population growth.

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Telecommunications and cloud computing will ______ transportation for moving ideas and intellectual property.

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Copenhagen has been voted the most ______ city in the world several times.