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Thiên Cung Cave, a beautiful ______ rock formation, is situated on a small island in Hạ Long Bay.

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When Khang went to Ninh Binh last year, he had a day tour to Hoa Lu, an ancient ______ of Vietnam.

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The Grand ______ is located in the state of Arizona, the United States.

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The project was done with the aim of raising public ______ of protecting the environment.

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It was Quang that first put down the signs of security.

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It is on the Galápagos Islands, Ecuador that unique flightless sea birds such as ______ can be found.

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Cúc Phương National Park is home to several ______ species of animals and plants that don’t live anywhere else in Vietnam.

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