—I had a great time in the summer holidays.We went scuba－diving in Hawaii.—Wow！A. I'm goin

问题补充：

—I had a great time in the summer holidays.We went scuba－diving in Hawaii.

—Wow！

A. Im going to Hawaii，too.

B. How generous you are!

C. That sounds really cool!

D. Enjoy yourself!

答案：

A. Im going to Hawaii，too.

B. How generous you are!

(答案→)C. That sounds really cool!

D. Enjoy yourself!

解析：由语气词“Wow！”得出，说话者觉得对方的经历很酷。