Choose the best word or phrases to complete the following sentences

Oil, natural gas, and coal are                 fuels.

Choose the best answer to complete each sentence.

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

Choose the best answer to complete each sentence.

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

Choose the best answer to complete each sentence.

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

Choose the best answer to complete each sentence.

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

Find out the ANTONYM of the underlined word from the options below

The high-speed train link is responsible for one of the biggest urban regeneration projects in the area.

Choose the best answer to complete each sentence.

By 2050, seven out of every 10 people on Earth will be a(n) ______ .

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