他今天有面试，因此穿了西装。

He's got an interview today, ___hence the suit.

因此，如果他们系了安全带，往往会冒更多风险。

___Hence, if they are wearing seat belts, they tend to take more risks.

因此，竞争越多，给人们和社会带来的好处就越多。

___Hence, the more competition there is, the more benefits are given to both people and society.