说服孩子们早睡是这个家庭最大的难题。

Getting the kids to bed early is the biggest ___problem in this family.

我的手机出了点问题，充不进电。

There's a ___problem with my phone—it won't charge.

我胃疼，这真是个问题。

I have a stomach ache, it's a real ___problem.