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This book is a great ___________ of information on polar expeditions.

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Archaeologists found a __________ with ancient paintings on the walls.

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Wind and solar power are forms of ____________ energy.

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They are building a new __________ station not far from my house.

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The wide use of ____________ fuels is causing them to run out.

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If we want to save the panda, we must focus on the __________ of its natural habitat.

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Many __________ species will eventually become extinct.

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Water flows down this ___________ in spring after the snow has melted.

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New __________ are being considered to protect our wildlife.

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Many coral reefs have ____________ for millions of years.

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My grandfather has a ____________ disability.