Transform the word in brackets so that it fits the text lexically and grammatically. Write the answer in capitals without gaps.

Sam went to the giant aquarium near his house at least three times a week. He liked the fish and crabs, but the most _____________ creatures there were sharks. Sam could watch them for hours. He took photos through the glass and collected _______________ about them. It surprised him how fast a massive shark could be. Before the aquarium opened, Sam thought it was ______________ for sharks to be so quick and graceful. He knew that sharks were __________________ \(DANGER\) but they seldom attacked people. Many people, however, had hunted them and sharks had become endangered. ______________, now there were laws protecting sharks. In the future, Sam wanted to be a ______________ and study sharks in the wild.