没有一些好建议就买车是危险的。

It's ___risky to buy a car without some good advice.

投资股票总是一种有风险的事情。

Investing in shares is always a ___risky business.

在这条路上骑车有点危险和费劲，所以我同意克里斯的观点。

Cycling on this road is a bit ___risky and demanding so I would agree with Chris on that point.