根据括号内的汉语提示填入适当的词完成句子。

1. Einstein developed __________(理论)of relativity.

2. Christopher Columbus was a ___________(勇敢的)man to go where no one had gone before.

3. Now Daniel's father is the youngest __________(教授)in his university.

4. When people in _________ (权力) is absent, people will do as they like.

5. the sooner the task will be done, the fewer people can be _________(牵涉)in.