3). The Great Barrier Reef Last year, I visited Australia and saw the Great Barrier Reef. It is the largest coral reef system in the world. The reef A over 2,300 kilometers along the northeast coast of Australia. It is home to thousands of marine species, including colorful fish, sea turtles, and sharks. The Great Barrier Reef is famous for its beautiful coral formations and clear blue water. Unfortunately, it is also B due to climate change and pollution. Many organizations are working to C the reef and protect its marine life. Tourists from all over the world D to see the reef and go snorkeling or diving. It is one of the most E tourist destinations in Australia. A. 1. extends 2. extended 3. extending