根据上下文语境和首字母提示, 在划线处写出一个合适的词。

Rafting

Rafting is an exciting adventure. A raft is a small boat that you can use to paddle down rivers and streams. Rafting is a good way to experience n【小题1】. If you want a normal rafting trip, choose a quiet stream or river that is wide and has few f【小题2】 trees or rocks. If you are looking for more e【小题3】, you may want to try whitewater rafting. Whitewater rafting is more a【小题4】 and difficult than normal rafting. It is done on rivers and streams where the water moves q【小题5】. You have to be c【小题6】 not to hit rocks, trees and other dangers. The name “W【小题7】” comes from the fact that the water in these streams and rivers looks white when it moves quickly.