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1. Suddenly he saw that the walls of the canyon__________________ with age-old carvings and paintings of strange unknown animals.
1) covered
2) were covered
2. London has an international reputation for its historic sites, museums and famous institutions. A city of infinite colour and ___________________, London is both historic and unceasingly modern, at the forefront of fashion, music and art.
1) variety
2) variation
3. The wide, wild world of animals interests many people. But, as civilizations crowd animals out of their natural habitats, __________________ and concerned citizens ask, �What is going to happen to animals?�
1) science
2) scientists
4. One place that has pioneered research in the __________________ of rare animals is the Wild Animal Park of San Diego, California. Its special concern is endangered species.
1) conserve
2) conservation
5. Although people can visit the Park, it is a 720-hectar preserve where animals walk __________________. Many people have a unique opportunity to take photos of rare wild animals in their natural environment.
1) freely
2) free
6. Divided into________________ sections, the Park has areas similar to the animals� natural habitats in Africa and Asia.
1) geography
2) geographical
7. He started __________________ the syrup diluted with soda-water to customers in his drugstore.
1) serving
2) to serve
8. That�s how the world famous drink __________________.
1) had invented
2) was invented
9. He made the course interesting with his many small __________________ explosions and crazy quizzes.
1) chemistry
2) chemical
10. Once, he posed the question: �What in the world isn't chemistry?� and offered a prize to the student who answered __________________.
1) correct
2) correctly

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