我们还有机会赢得比赛。

We still have a ___chance to win the game.

这次旅行是个了解当地文化的好机会。

This trip is a great ___chance to learn about the local culture.

我在街上偶遇了多年未见的老同学，真是纯属巧合。

I ran into my old classmate on the street by pure ___chance.

我不想冒险在这么晚的时候独自走回家。

I don't want to ___risk walking home alone this late.