我昨天打电话给他们，想核实一下他们什么时候到。

I called them yesterday to ___check when they will arrive.

计时器响的时候，你能检查一下蛋糕好了吗？

Would you ___check if the cake is ready when the timer rings?

我给公司打了电话，想核实一下我是否真的中了头奖。

I called the company to ___check whether I really had won the jackpot.