Choose the best answer.

Solar energy is not widely used _____ it is friendly to the environment.

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Known worldwide by its panda logo, World Wildlife Fund (WWF) is dedicated to protecting _____ world's wildlife and the rich biological diversity that we all need to survive.

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He talked about his incredible experience of being _____ space, looking down on the Earth.

Find the mistake.

Sylvia Earle, an underwater explorer and marine biologist, who was born in the USA in 1935.

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Ecology is the study of our _____ environment.

Choose the word OPPOSITE in meaning to the underlined part.

I don’t think we should kick the can down the road and let our next generation solve the global warming problem.

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If it hadn't been for the storm, the farmers _________ a great harvest last year.