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.

我牙齿有问题，需要去看牙医。

I have a ___problem with my teeth, I need to see a dentist.