Exercise 4: Discussionの回答例です
A1. It seems that Kahaluu Bay is one of the most crowded bays in the world. So, the result of the survey are very convincing.
A2. I have seen a coral reef in Okinawa located in the south of Japan. While staying on that island, I have experienced the first dive in my life. I found a turban shell on the bottom of the sea and I picked it up.
A3. A polar bear will be affected by climate change extremely because It is said that all Arctic ice is melting due to global warming.
A4. Tuvalu, an island country in Polynesia, located in the Pacific Ocean is most susceptible to the sea surface elevation caused by global warming. Because Tuvalu is sinking into the sea now.
A5. I try to use a train as much as possible instead of my own car. Because the transport efficiency of a train is better than that of a car.