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• between
• among
• tropical
• equipment
• inhabit
• careless
• careful
• polluted

Off the eastern coast of Australia is the world's largest coral reef. The clearness of the water around this reef makes it possible to see many details of the undersea world. Coral shapes look like flowers and strange animals. [ ] the coral shapes, swimmers can see exotic [ ] fish and plants. This is the world of bright colours and sudden movements. One must enter this world carefully, using underwater-breathing [ ]. Then you can swim among the coral reefs and admire the graceful coral structures and numerous breathtaking underwater creatures that [ ] this world. Unfortunately, people have been [ ] about the reef. They caught more fish than they needed to use, collected loads of live shells, [ ] the water with oil spills. Luckily Australian government is working to protect this unique natural treasure. Much of the Great Barrier Reef is a national park now.