投资股市总是伴随着很多不确定性。

Investing in the stock market always comes with many ___uncertainties.

他对这次考试的结果感到不确定。

He has some ___uncertainties about the results of this exam.

新政策带来了许多不确定性，我们需要更多时间来评估影响。

The new policy brings many ___uncertainties, and we need more time to assess the impacts.