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Thousands of species of animals and plants are _________ and the number decreases each year.

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Nowadays, people are searching for more ____ materials to build their houses.

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We need to act quickly to ____ to climate change, or it will be a disaster for the whole planet.

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She was walking to the library to borrow some books when she was seeing a robbery.

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I didn't speak to Anita. I didn't see her.

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Although my parents are busy at work, they try to find time for their children.