根据句子意思，用括号中所给单词的正确形式填空。(每空限填一个单词)

Alice fell for a long time, and then she found ____  (she) alone in a long, low hall.

Some people think that wolves are dangerous to ____ (human).

The exam is much  ____ (easy) than we expected. Great!

We should use our pocket money ____   (wise).

Neil Armstrong is the first man to walk on the Moon. It was brave of him to go to a place that was ____   (know) to people at that time.