Read the text and choose the correct answer.
The Great Barrier Reef is one of the world's natural (15) _________. It is off the coast of Australia. Visitors swim in the sparkling waters around it. (16) _________ see amazing views of sea life.
A recent study found that 93% of the Great Barrier Reef has been (17) _________ by coral bleaching. Warm water temperatures are one cause of the bleaching. Pollution is another cause.
Reefs are important. They help protect communities near the coast (18) _________ flooding. They attract visitors and bring jobs to the area. Reefs are also a habitat for sea life.
It is possible for the Great Barrier Reef to (19) _________. But it is not easy. Groups in Australia are trying to help. They say people should use energy that doesn't warm the planet. Cutting (20) _________ fishing can also help. So can cleaning up pollution. Together, people can help save the Great Barrier Reef.
